Why “Y2K?” Why now?

Seriously, WTF, Gen Y and Kyle Mooney?  Films? LOLs? Not on your life, A24 Films.

The ex-“SNL” player Mooney co-wrote, directed and co-stars in “Y2K,” a “horny teenager” comedy that aims to be a sort of Gen Y “Superbad” or “Can’t Hardly Wait” or any teen movie with a party. But it’s about as deep and um “funny” as Billy Joel’s Boomer nostalgia anthem “We Didn’t Start the Fire.”

No, making scores of pop culture references — “The Macarena,” AOL and “You’ve Got Mail,” video stores and their “garden of Earthly delights” (porn-packed) back rooms, Alicia Silverstone — does not constitute a “good song,” or viable a screenplay. It’s barely worthy an “SNL” sketch, one Lorne Michaels would have no doubt “cut for time.”

And then “Y2K” morphs into a “singularity” apocalypse, a “This is the End” with electronics run amok and bringing the world to the brink horror comedy.

It fails on pretty much every level, from the recycled cliches of teen party comedies — bullies, standing up to bullies, finally getting to know the cute/smart girl whose computer skills are already sharp enough to merit teen tech bro sexism — to the relationships set up ame the comic set pieces in that video store, at that party and in their school, which is where the machines will meet up to plot their end game for humanity.

Here’s what’s funny. New Zealand’s hobbit-born WETA Workshop cooked-up robots that computers, camcorders, skillsaws and the like DIY into the stumbling waffle-iron-footed beasts that kill humans. These walking, patchwork electronic sight gags round up survivors for “assimilation” into the tech dominated “future.”

And another Kiwi export, that “Hunt for the Wilderpeople” kid Julian Dennison scores a few giggles as the sassy, rotund bestie to nerdy wallflower Eli, played by aging-out-of-child actor Jaeden Martel of “It,” “St. Vincent” and “Knives Out.”

They play the kids who try to warn their classmates of the danger that errupts at midnight at the not-that-wild teen party they’re attending.

“That’s like, racist against MACHINES!” is what they hear in response.

But events conspire to throw assorted punks, the video store clerk (Mooney himself, in dreads and dreadfully unfunny), the besties, Goth-punk Ash (Lachlan Watson) and exotically gorgeous Laura (Rachel Zegler of “West Side Story”) together in a sluggish scramble to survive New Millennium Eve.

The dialogue — that which isn’t mumbled-by-in-a-rush — is forgettably unquotable.

The nostalgia is very much a mixed bag, with those pop culture references from that era hammered home with the music of Chumbawumba, Harvey Danger and Blink 12, and with the film opening with President Bill Clinton updating the nation on Y2K eve on what a competent administration does to fix a possible major problem — by tackling it in advance.

Fred Durst makes an entrance. OK. Sure. Fine. Remember Limp Bizkit?

But did we really need to bring back that comic bad penny Tim Heidecker (playing Eli’s dad, with Silverstone as his mom)?

No. No we did not. Not under any circumstances. And if Heidecker’s who Mooney thought of or thinks is funny, I think I see the problem right there.

Rating: R, graphic violence, drug abuse, sexual situations, profanity

Cast: Jaeden Martel, Rachel Zegler, Julian Dennison, Alicia Silverson, Lachlan Watson, Kyle Mooney and Fred Durst

Credits: Directed by Kyle Mooney, scripted by Kyle Mooney and Evan Winter. An A24 release.

Running time: 1:31