“Kidulthood” — or, quite irritatingly, “KiDULTHOOD” — bills itself as a foul-mouthed, street view of the seedy, shady, secret world of teenagers. A group of British teenagers, who treat each other like violent prisoners in a world without guards, are allowed the day off from school when they torment a fellow student into hanging herself.

They go on to have a day that includes shoplifting, unprotected sex, prostitution for drugs, an affirmative pregnancy test and parents so clueless they’d miss a gang bang in their breakfast nook. Bad boys smoke joints in restaurants and girls sell drugs for club clothing money.

It’s so cheesy. It’s like peering into Ann Coulter’s nightmares. It wishes very badly that it could freak people out like 1995’s “Kids.” But it’s more like another movie whose message can basically be summed up as “smoking marijuana leads to jumping out of windows” — “Reefer Madness.”