The sound comes from the world of SpongeBob SquarePants, the long-running Nickelodeon cartoon known for loud, exaggerated reactions to everyday disasters. Stinky gags have been a running joke in the show, and short clips of its sniffing and gagging reactions were lifted for soundboards and meme edits. Online creators now use it as shorthand for anything foul, from bad food to unwashed clothes, because the cartoon delivery is instantly recognisable even without the picture. Its short length makes it easy to drop into edits, reaction videos and prank clips.