The exact source of this two-second clip is unknown, but it reached soundboards under a playful stretched spelling of the word boing. The cartoon boing itself is one of the oldest comedy effects, dating back to mid-century slapstick animation, where a plucked spring or jaw harp sold every bounce and pratfall. This short warbling version fits the modern loop of goofy meme sounds passed between creators: easy to drop under a fail clip, a stretchy transition or a punchline caption, and familiar enough that viewers hear the joke before the visual lands.