The phrase comes from Doctor Who, where the Tenth Doctor describes time as wibbly wobbly, timey wimey stuff in the 2007 episode Blink. The line became one of the show's most quoted jokes and spread far beyond its fanbase into GIFs, captions and edits. As a standalone sound, the wobble version took that idea literally, turning a time travel explanation into a jelly-like effect for anything unstable. It stays popular because viewers understand it instantly without needing the original episode for context.