The effect comes from the classic cartoon sound library credited to Jimmy MacDonald, created for the Donald Duck short Chef Donald released on December 5, 1941. Catalogued as a cartoon fiddle slide, it belongs to the era when a small team of sound editors built reusable whistle and string slides for slips, falls, and quick exits. Those library cues were reused across decades of animation and later sampled into modern editing packs, which is why the wheep and zip still turn up in memes, shorts, and fan edits today.