The premise is completely formulaic and potentially cheesy: A couple of go-nowhere buddies get arrested and, for their community work assignment, must serve as big brothers to a pair of misfit kids.

You know from the beginning that many necessary life lessons will be learned and that all parties involved ultimately will be better off for the unlikely friendships they’ve formed. But it’s the wildly, hilariously crude way that director David Wain and Co. approach this concept that makes “Role Models” so disarming.

The delivery from co-stars Seann William Scott, Paul Rudd and the supporting cast of both comedy veterans and up-and-comers makes the material consistently laugh-out-loud funny.

Wain and Rudd are among a half-dozen people who get screenplay and/or story-by credit here. Scott and Rudd are at the film’s core, though, and their disparate styles provide an appealing mix; Scott again plays the manic ladies’ man with no internal censor, while the typically deadpan Rudd is always ready with a sardonic one-liner.

Scott’s Wheeler and Rudd’s Danny spend their days giving peppy, just-say-no talks at Los Angeles schools and peddling the energy drink Minotaur, a job that requires Wheeler to dress up in a furry costume and guzzle gallons of green gunk. Danny, fed up with his life and frustrated that his longtime girlfriend (Elizabeth Banks) has just rejected his impetuous and ill-timed marriage proposal, snaps one day and gets himself and Wheeler in trouble with the law.

Rather than going to jail, the two end up working with the Sturdy Wings mentoring group, led by the damaged but overly earnest Gayle (Jane Lynch).

Wheeler gets paired up with the freakishly foul-mouthed Ronnie (Bobb’e J. Thompson, radiating a scary amount of confidence for a 12-year-old), who’s been raised by a single mom his whole young life. No previous big brother has stuck around for more than a day, but rather than feeling daunted by this petulant brat, Wheeler views Ronnie as a personal challenge.

Danny, meanwhile, gets stuck with the uber-dweeby teen Augie (Christopher Mintz-Plasse, doing a more vulnerable variation on his “Superbad” character, McLovin), who’s obsessed with his live-action fantasy role-playing game. Augie is part of Sturdy Wings at his parents’ insistence: They want him to be a normal kid. Of course, we’ll all come to the conclusion that Augie is just fine the way he is.

This is the kind of movie in which an adult and a child can bond over the not-so-subtle metaphor contained within the song “Love Gun.” Inappropriate? For sure. But also kind of sweet — and a model for comedies that are trying to strike that elusive balance.