The line comes from Mike Judge's 2006 comedy Idiocracy, where a disheveled man shouts it through a door to brush off a visitor. Baitin is slang for masturbating, which is why the blunt delivery became a running joke among fans of the film's crude satire. Years later the two-second clip resurfaced on soundboards and meme pages as a universal rude brush-off. It endures because the phrasing is instantly quotable and the taboo punchline catches first-time listeners off guard every time.