The line comes from Family Guy, where Stewie Griffin is the family's precocious baby and Peter Griffin is his father, the usual target of the show's fat jokes. Clipped from the series and shared on soundboards, the short exchange became a handy reaction sound because it needs no setup: Stewie's voice and the insult are instantly recognisable to fans. It spread through memes, edits and reaction videos, where creators use it to shut down a character or joke without explaining the scene. Its brevity keeps it useful for short-form video.