Chris Farley was an American comedian known for loud, physical, all-in performances on Saturday Night Live in the early 1990s and in films such as Tommy Boy. His style turned simple reactions into memorable moments, which is why short exclamations like this one were picked up early by soundboard sites and meme editors. The clip circulates mainly as a reaction sound rather than a quoted scene, and it stays in use because Farley's voice is instantly recognisable and the delivery fits almost any moment of comic shock.