The one-nighters were starting to blur together.

After 11 years in comedy clubs, Matt Rife was selling around 70 tickets per show, sometimes clearing as little as $150 a night.

He wasn’t a big enough name last summer to earn an invitation to the Just for Laughs festival in Montreal, an annual showcase for established comics and promising up-and-comers alike. But he decided to go anyway.

During that trip, Mr. Rife underwent a surprise transformation from middling road comic to star, a change he described last week over a cheeseburger lunch in Syracuse, N.Y.

“Last July, I was in Montreal for a festival I was not invited to,” he said. “I had to fly myself out, put myself up for no pay. I was sitting there at dinner with my friend and my manager. I’m about to post this video of crowd work. I was watching it, and I was like, This is so stupid. Why am I even doing this?”

The video in question showed him onstage in Phoenix, Ariz., going back and forth with a female audience member who said she had broken up with her boyfriend because, as she put it, “he didn’t do anything” when he came home from his job. During the exchange, Mr. Rife learned that the woman’s ex was an emergency room worker.

“Oh, I’m sorry — you broke up with a hero?” he said, to roars of laughter.

Despite his reservations, Mr. Rife posted the two-and-a-half-minute video on TikTok, which he had joined a few months earlier. He titled the clip “The Lazy Hero.”

“That video did 20 million views in two or three days,” he said. “It became this massive chain reaction and an explosion of an audience. From then on, every video I posted went viral.”

Over the next few months, Mr. Rife, 27, racked up 15.6 million TikTok followers. The online success allowed him to leap ahead of his fellow club comics, making him a significant draw.

When he announced his “ProbleMATTic World Tour” last month, he sold out 260 dates in North America, Europe and Australia in 48 hours. The flurry of sales — 600,000 tickets in all, each ranging between about $50 to $95, according to Live Nation — crashed the Ticketmaster website. Some resale tickets cost more than $500.

Although Mr. Rife has developed an easy stage manner, thanks to the countless hours he has spent at the mic, his popularity may have as much to do with his cheekbones as his comedic chops. Tall and strikingly handsome, with blue eyes, a chiseled jawline and full lips, Mr. Rife is something rare in the comedy world: a heartthrob.

He has played his looks to his advantage. A black-and-white glossy photograph on his website shows him shirtless and tattooed in a bad-boy pose. His hair is always artfully tousled like that of a boy band member. He wears rolled-up T-shirts onstage that show off his toned biceps.

His fans tend to be young and female. They shout out to him, ply him with gifts and regularly proposition him. His club dates are often raucous events, more “Magic Mike” than Comedy Central Presents.

He titled his first YouTube special “Only Fans,” he has said, because people were searching “Matt Rife Only Fans” on the internet, to see if he had an account on the adult-themed website. The click bait worked: The show garnered more than 8.5 million views.

Mr. Rife’s material, heavy on sex and relationships, and his viral TikToks, which focus on his interactions with people in the crowd, seem to encourage audience participation and add to the fevered atmosphere of his shows.

At the restaurant in Syracuse, he was approached for photos by two male employees — Bobby Adkins, a cook, and Tom Steber, the restaurant manager — which he took as a sign that his fan base was expanding.

“You’re one of my favorite comedians,” Mr. Adkins told him.

“I appreciate you, man,” Mr. Rife said. He stood, shook the man’s hand and complimented his Air Jordans, saying, “I like the J’s.”

He had been in Syracuse two days but he had not visited the Erie Canal Museum, the Rosamond Gifford Zoo or any other local attraction. An insomniac, he usually goes to bed at dawn. If he’s not sleeping late, he’s up early attending video meetings with his management team.

To keep up with demand, he has been doing as many as 10 performances a weekend. In Syracuse last week, he did six shows over three days at the Funny Bone comedy club — all sold out — in addition to joining two friends who host a paranormal podcast, “Haunted Homies,” for a packed live show at the same venue.

“This time last year, I couldn’t sell out one show in a town,” Mr. Rife said. “It’s still so new and exciting that I’m, like, ‘OK, you need to do everything.’”

Gag Gifts

As show time neared, Mr. Rife rode in a drizzling rain through a desolate part of Syracuse, passing large tracts of undeveloped land. At the wheel of the car was Brandon Manzonelli, 33, a former professional soccer player turned male model who for six years was Mr. Rife’s roommate in Los Angeles and is now his road manager.

Mr. Rife was wearing white Nike high-tops, gray jeans and a T-shirt with a sexually suggestive graphic that referred to cunnilingus — his stage outfit, it turned out. He had to stop by his hotel room, he said, to grab a different top that he planned to wear for the second show that night.

Back in the car, on the way to the Funny Bone, Mr. Rife reflected on a recent career highlight. He was invited to perform at a comedy show put on by Dave Chappelle in Yellow Springs, Ohio. He also hung out with Mr. Chappelle.

“We just smoked and talked for, like, four hours,” Mr. Rife said. “And he gave me 30 years’ worth of advice.”

What did Mr. Chappelle tell him?

“He emphasized the importance of staying true to yourself and to not adhere to industry or network standards,” Mr. Rife said. “Even today, fighting cancel culture with every show he does, I just admire him for that so much.”

Onstage, Mr. Rife spins jokes from topics like autistic children, pedophilia and people in wheelchairs, alternating between being sweet and devilish. After he talked crudely about women’s bodies during a February appearance on the “Stiff Socks” podcast, he drew heavy criticism on social media. So far he has not faced a controversy that has affected his career or made him rethink his approach.

“You’re mad at somebody that’s just trying to make you laugh?” Mr. Rife said. “That’s such an insane concept to me.”

By the time Mr. Rife ducked into the green room of the Funny Bone, the 300-seat venue was full and buzzing with energy. “You go to places like this and there’s really nothing else for them to do,” he said, explaining his fondness for smaller markets. “They’re so nice and they’re so there for the show.”

The night before, after Mr. Rife’s performance, a man presented him with a bag heaping with penis-shaped candies and other gag gifts typically exchanged at a bachelorette party. The X-rated edibles now sat on the floor in the green room.

“And that’s what we didn’t eat,” Mr. Rife deadpanned.

He said he received such gifts at practically every show these days, perhaps because he once did a bit about giving his grandfather a sex toy for Christmas.

Mr. Rife said his sex appeal, like his career surge, is relatively new. He described himself as a late bloomer and, indeed, photos from a few years ago show a gangly-looking youth whose strong jaw, high cheekbones and Jagger-esque lips had yet to coalesce into a pleasing whole.

“I was so ugly for so long,” Mr. Rife said on his “Only Fans” special. As a result, he continued, “I spent the first 22 years of my life building a personality. For what? You think I need to be funny now?”

Backstage, Mr. Rife was surrounded by his small entourage. In addition to Mr. Manzonelli, there was Kyle Varney, his videographer; Alex Cureau, a comic who has been serving as his opening act; and John Campanelli, a veteran standup who was hosting the Funny Bone shows. Sitting beside him on a leather couch was Garrett Abdo, a comedy club owner from Atlanta who signed Mr. Rife to a management contract when he was still in high school.

Mr. Cureau, 31, said his fortunes had risen along with those of his friend. “Last year, I was sleeping on the floor of Matt’s hotel room,” he said. “Cut to last week, we’re in the corner suite.”

‘Syracuse, What’s Up?’

Mr. Rife, who is from North Lewisburg, Ohio, saw his first comedy show in the mid-2000s, when his grandmother won tickets in a radio station contest to see Dane Cook at Nationwide Arena in Columbus.

“He was so full of energy, and he created such an amazing show,” Mr. Rife said of Mr. Cook, one of the first comics to find a significant fan base through the internet.

Soon after that, he started doing open mics. He was 15.

Mr. Abdo discovered him when he got into a funny exchange on Twitter with the comedian D. L. Hughley. He invited him to perform at a club he ran in Atlanta. Impressed by his raw talent and drive, Mr. Abdo brought Mr. Rife back for a comedy festival and put the teenager up in his house for the summer.

“I Mr. Miyagi’d him,” said Mr. Abdo, referring to the teacher in “The Karate Kid” and explaining that he used to make Mr. Rife perform to an empty room while he jangled keys in his ear, preparing him for boisterous clubs.

“He threw tennis balls at me, too,” Mr. Rife said.

Mr. Rife missed his junior and senior proms — he was on the road, doing gigs. Then came a decade of grinding. The high points included his stints as a co-host of MTV’s short-lived “TRL” reboot and as a cast member of the sketch show “Wild ’N Out.” He also made an appearance on an episode of “Brooklyn Nine-Nine” and saw his name in People magazine when he was romantically linked to the actress Kate Beckinsale.

“There are all these young comics now who think they’re going to do what he did with TikTok,” Mr. Campanelli said backstage. “You’re not 12 years in. You’re not Matt Rife.”

In a moment Mr. Rife was called to the stage.

“Syracuse, what’s up?” he said to whoops and screams.

During his hourlong set, Mr. Rife did bits about masturbating in the shower and getting caught watching porn by his stepfather. He made a school shooting joke to groans (“Now the show has started,” he said) and riffed on how, despite his online fame, he hates social media.

“It’s garbage, dude,” he said. “I’m canceled three times a week, bro.”

After the show, audience members who had paid $150 for a photo with the star began lining up near the stage as Mr. Rife relaxed in the green room. As recently as April, he said, he would stay after his shows to mingle with anyone who wanted to meet him. But the lines got so long — “I was there for an hour and half,” he said — that he put a cap on the number of fans.

It’s possible that his fans will rarely see him perform in a place as intimate as the Funny Bone in the years to come. On this night, about 30 people were gathered when he finally emerged. Amanda Alfred, 25, was halfway down the line.

“This is my first comedy show,” she said, adding, “It’s surreal being here. God, I’m nervous.”

When it was her turn for a photo, she told Mr. Rife that she’s been a fan since his time on “Wild ’N Out.” He laughed, saying, “Whoa, don’t age me like that.”

They turned to face the photographer. Just before the picture was snapped, Ms. Alfred put her arm around Mr. Rife’s waist and held him there, if only for a moment.