Weeks after a December Instagram post in which he said he didn't "want to be on this earth anymore," Pete Davidson laughed his way into 2019 – and took aim at fellow comedian Louis C.K.

In addition to sharing his thoughts on being name-dropped in a song by ex-fiancée Ariana Grande, the 25-year-old comedian had a few choice words for C.K., whom he accused of trying to get him fired from "Saturday Night Live."

The revelation, which was reported by Newsweek and Us Weekly, sprang out of a joke in which Davidson wondered if his choice of tattoos was a causal factor in a couple of celebrity deaths.

"I got a Harry Potter tattoo," he told the audience during "Pete Davidson & Friends" show in Boston. "Then the next day, Alan Rickman, the guy who played Snape, died, and I was like, 'Oh, what a weird coincidence,' " Davidson joked, according to E!

He continued, "Then I got a Willy Wonka tattoo. Next day, Gene Wilder dies. Now I'm like, all right, that's a coincidence, that's weird. So I'm thinking of getting a tattoo of Louis C.K., what do you guys think?"

C.K., who admitted to sexual misconduct last year, had again been criticized for mocking students who survived last year's mass shooting in Parkland, Florida during his latest comeback set.

Davidson said that the last time C.K. hosted "SNL" in April 2017, the "Louie" star "told all the producers in front of me that 'all this kid does is smoke weed and he's gonna smoke his career away.'"

The "SNL" star, who has said he uses marijuana to cope with chronic pain brought on by Crohn's Disease, claimed C.K. told executive producer Lorne Michaels, "Pete smokes so much weed that it makes people uncomfortable."

It was the first stand-up set since the comedian worried colleagues and fans with a December Instagram post in which he said he didn't "want to be on this earth anymore."

During his two cathartic performances, Davidson also revealed that he cried to his mother following his broken engagement to Grande and shared his thoughts on her breakup anthem, "Thank U, Next."

"Usually, breakup songs you know who it's about but you don't really know," Davidson said, according to E! News and The New York Times. "Bam. She named all of us."

Davidson recalled the song (in which Grande sings: "Even almost got married / And for Pete, I'm so thankful") was released right before "SNL" aired, describing it as a "sad day."

"That (expletive) came out before I had to put on a (expletive) duck hat and be like, 'derrrp here's the pizza!' So all my friends were there. …We didn't know it was going to happen," he said, according to E!

Related: Ariana Grande says her exes heard 'Thank U, Next' before its release

The comedian split with Grande in October after a whirlwind romance, which was the fodder for at least two "Weekend Update" segments this fall, including an appearance with wounded Navy SEAL-turned-Congressman-elect Dan Crenshaw, whom he had compared to a "hitman in a porno movie."

He had kept a low profile during the final episode of "SNL" of 2018, where he was not seen aside from introducing musical guests Miley Cyrus and Mark Ronson. That was the same night he deleted his Instagram account.

On Dec. 23, Davidson was spotted above the stage at friend Machine Gun Kelly's concert in Cleveland.

Related: Pete Davidson gets VIP treatment at Machine Gun Kelly concert a week after disturbing post