short for "Shit No Tits" movie. It is a movie whose title/plotline/movie cover suggests some sort of sexuality which provokes horny teenage males to watch the movie in hopes of seeing some fucking titties. Sadly for these aforementioned males, they are let down when they find that there are indeed no titties in the film that they watched.
National Lampoon's Adam and Eve is a classic SNT movie, for it totally wasted its own R rating. Come on, the director wasn't placing the camera in the right place, and Cameron Douglas was getting all the fucking titty action, lucky bitch.