This big-screen version of the crude, rude Comedy Central cartoon series is nastier than it is subversive or funny. Grade school boys Kenny, Kyle, Stan and Cartman sneak into an R-rated “Canadian” movie. Their newly acquired vocabulary then upsets school authorities, horrifies their mothers, propels America into war with our neighbors to the north and ignites The Apocalypse. Director Trey Parker has not tinkered with Park’s original, cheesy animation style (which I find amusing), but the foul-mouthed script he co-wrote with Matt Stone is a repetitive exercise in shock cinema littered with about a dozen forgettable musical numbers. Example of what you can expect: Saddam Hussein joking around with a fake penis and buggering Satan.