The effect comes from the Sound Ideas Classic TV Sound Effects library as a vintage recording titled Continuous Springing Bounce with Comic Flexible Accents. Libraries like this supplied the boings heard in mid-century cartoons and later television comedy, where a single flexible spring sound could sell a hop, a pogo stick or a character stretching out of shape. Editors still reuse it today for retro cartoon edits because it reads instantly, much like a Mario Jump in games, even without any picture at all helping it.