The phrase guai guai de is everyday Mandarin for describing something that feels off or unusual, and as a standalone clip it has circulated on user soundboards as a compact reaction sound. At under one second it works like a spoken emoji, shared in edits, streams and group chats when words would take too long. Its appeal is its brevity and tone rather than a known scene or celebrity, so creators reuse it across unrelated videos and it remains recognisable purely from the puzzled delivery and repeated wording.