The line comes from South Park, the long-running animated comedy created by Trey Parker and Matt Stone. It is closely linked to Towelie, the talking towel character introduced in 2001, whose whole identity became a running gag on the show. Fans clipped short Towelie exchanges for forums, videos and soundboards, and this insult survived because it works without any setup. Even people who have not seen the episode recognise the rhythm and use it as a light, nonsense comeback online today.