The chant comes from the 1978 comedy Animal House, where members of the Delta fraternity shout it during their infamous toga party scene. The scene helped turn the toga party into a lasting college tradition, and the shout became shorthand for letting loose and embracing chaos. Over time, clips of the chant circulated in party videos, compilations and memes, keeping it recognisable long after the film's release. It endures because it captures a specific kind of reckless, communal fun in just two words.