Online, this short Mandarin phrase is shared as a reaction sound for moments of confusion, concern or mild disbelief, often in short-form videos, memes and chat clips where the speaker is not shown. Because the meaning is simple and the delivery is instantly recognisable as a question, creators use it even when their audience does not speak Mandarin, relying on tone and context to carry the joke. Its brevity makes it easy to drop into edits without slowing the pace, which helps it keep circulating as a quick, relatable reaction.