The exact origin of Grandma Gooning 9-5 is not widely documented, and it circulates mainly as a niche user-generated soundboard clip rather than a line from a well-known show or film. Its leetspeak-style title points to internet meme culture, where odd word combinations gain traction through edits, reaction videos and short-form posts. Because the joke is short, self-contained and instantly recognisable by name, it works as an in-joke for viewers who already know meme formats, even without a mainstream source behind it.