No lo creo is a common Spanish expression meaning I do not believe it, and as a short audio clip it circulates mainly as a reaction sound rather than as a line tied to one identifiable film or show. Its appeal comes from its universality: disbelief is easy to understand across languages, and the brief length makes it easy to drop into memes, chats, and short videos. Creators keep returning to it because it expresses skepticism in a single beat, without needing context or translation for the joke to land.