The phrase comes from the title of a South Park episode, The Biggest Douche in the Universe, which first aired in 2002 and parodied television psychics. As the title circulated as a catch-all insult, fans began using it as a standalone roast in memes, reaction videos and soundboards, where its over-the-top scale makes an ordinary arrogant moment feel absurd. It survives because it is instantly understood, easy to drop into a short edit, and broad enough to fit celebrities, gamers, politicians and everyday braggarts alike.