The coming-of-age teen sex comedy genre goes younger and supposedly edgier in “Snack Shack,” which tells the story of randy Xennials in 1991 Nebraska City, Nebraska.

The follow-up to writer-director Adam Rehmeier’s quirkier “Dinner in America” is a transgressive, tedious and terribly predictable slog whose few light moments don’t break the coarse spell it casts.

The novelty here is that A.J. (Conor Sherry), aka “Eagle” (as in Eagle Scout) and Moose (Gabriel Labelle), the besties smoking and hustling, cutting out on the class field trip to bet on greyhounds at an Off Track Betting office in Iowa, learning how to make beer and learning how to make bongs out of beer cans, are 14.

All their best-laid plans all seem to pay off. Betting at the track, for instance, requires a “system,” they assure the adults.

“You’re 14 years old! You don’t have a friggin’ SYSTEM!”

Imagine how shocked A.J.’s parents, Jean and The Judge (Gillian Vigman and David Costabile), are to learn that he’s emptied out his college savings account for their next scheme, bidding on the rights to run a small business — the “snack shack” at the popular town pool over the coming summer.

The generation that would later be labeled “lazy” (by Time Magazine and other old timers) has produced two chatterbox entrepreneurs who have brewed some convincing “real beer,” and who — Moose insists — are about to make bank on selling hot dogs, drinks, candy and other snacks to avid poolgoers the summer after “The Liberation of Kuwait.”

Their protector and chief enabler is a soldier (Nick Robinson) pal and mentor home on leave. And the free electron who will break up these two molecularly-joined friends is the hot new lifeguard and “cousin” to a neighbor kid, Brooke (Mika Abdalla) who is old enough to drive and oddly “interested” in each boy in a kind of pervy “Jules and Jim” way.

Such pictures typically trot through the usual rites of passage — coping with bullies, after hours “night swims,” pre-Rave “raves,” bringe drinking, non-sibling rivalry over a lady fair, bonding, making big plans and playing poker.

As our two leads in no way pass for middle schoolers chomping at the bit to go to high school, Rehmeir is offering up a genre parody, just not a funny one. And he’s not actually sending-up the male wish fulfillment fantasy that drives some male-dominated movie memoirs, but he might as well be, leaning on “Fast Times at Ridgemont High” and others that trafficked in that.

Young Sherry, an alumnus of Nickelodeon’s “Are You Afraid of the Dark?” makes a sensitive-if-not-remotely age-appropriate lead. Labelle (“The Fabelmans”) is Every Teen Hustler you’ve ever seen, and former child actress Abdalla, most recently seen in “The Flash,” is well cast as that voluptuous “older woman” object of many a horny teen’s desire.

The period piece setting is indifferently managed, with more cars from the ’70s than the ’90s, and a modest sampling of the pop music of the era — Tone Loc’s “Wild Thing,” etc.

For a film that flirts with a statutory rape/child endangerment edge, “Snack Shack” is awfully tame, a movie about enterprising kids growing up too fast and permissive parenting that enables that with trite lessons about life and love and recklessness borrowed from decades of movies like this, going back to “American Graffitti.”

“Personal” picture or whatever larger objective Rehemeier was aiming for, he’s made a very long and not that funny comedy connected by disjointed and generally unoriginal scenes rather than a coherent narrative.

Rating: R, fisticuffs, sexual situations, underage drinking, pot use and profanity

Cast: Conor Sherry, Gabriel Labelle, Mika Abdalla and Nick Robinson

Credits: Scripted and directed by Adam Rehmeier. A Republic release.

Running time: 1:52