Uncle Fucker comes from the 1999 film South Park: Bigger, Longer and Uncut, where it opens the fake Terrance and Phillip movie Asses of Fire. Written by Trey Parker and Marc Shaiman, the song was meant to parody how parents in the show blame Canadian comedy for corrupting children. Its over the top profanity helped the track become one of the film's most quoted moments, and clips of the chorus have circulated for years as a meme sound for crude jokes and reaction edits.