Ay Wey is a common Mexican Spanish expression of surprise, similar to saying oh wow, and this version is credited to creator RaulU, whose short vocal clips circulate on soundboards for quick reactions. Because the clip is under a second long, it fits easily into memes, edits and short-form videos where a spoken reaction is more expressive than text alone. Its popularity comes from that simplicity: listeners recognise the phrase instantly, even without context, and creators reuse it whenever they need a fast, playful jolt of surprise.