This sound is widely shared online as a generic comedic reaction cue rather than for a clearly documented single source. In meme culture, the classic "tururu" is used like a tiny audio punchline for fails, awkward pauses and disappointing reveals. Its popularity comes from being short, easy to place and immediately readable even without context. It keeps circulating in reposts, short edits and messaging app clips because creators can drop it into almost any anticlimactic moment and get the joke across fast.