This kind of squish has no single famous source, which is part of why it travels so well across short videos. It belongs to the broad family of wet foley effects used in cartoons, comedy sketches, and meme edits to make a soft, messy action sound instantly recognisable. On soundboards it sits alongside other short reaction noises, ready to drop into a clip without needing any context or dialogue. Creators keep returning to it because the sound is immediately understood, works in almost any silly situation, and adds a tactile joke in less than half a second.