This effect comes from the Hanna-Barbera cartoon sound library, the collection of exaggerated effects that defined the studio's animated comedies. Sounds like this were reused across many episodes to make impossible movements feel funny and instantly readable, even without dialogue. As those cartoons were rerun and clipped online, the stretching effect became a shorthand for cartoon physics in memes, edits and short videos. Creators still reach for it because it signals slapstick immediately, without needing any explanation.