The sound is a parody of the THX Deep Note, the distinctive glissando heard before films in THX certified cinemas since the early 1980s. That original build became instantly recognisable, which made it a natural target for parody versions that swap grandeur for a fart. This version spread as a short prank clip on soundboards and in meme edits, helped by its long bass swell and simple speaker test joke. It remains popular because everyone knows the setup, so the crude payoff needs no explanation.