MTV's resident animated fart-knockers graduate to the big screen with all their trademark preoccupations intact: scoring, chicks, big thingies, scoring chicks with big thingies and sundry others either mammillary or scatological in nature. It's just as juvenile as you'd expect, and even funnier. There is a plot, but that's really beside the point: Suffice it to say that after the unthinkable happens -- they wake up to discover their beloved TV has been stolen -- Beavis and Butt-head (both voiced by their creator, Mike Judge, who's also the director) embark on a cross-country road trip that takes them from Las Vegas to Washington, DC, by way of Weippe, Big Piney, Peck, Meeteetse, Butte -- are you getting the picture? The cornerstone of the TV show -- music videos whose pretentions are punctured by our heroes' running commentary -- has been dropped. But by way of recompense, we're treated to a disquisition on the semantic paradox that results when one attempts to describe a donkey defecating. Whatever your I.Q., it's really one of the more enjoyable animated films since SNOW WHITE.