Ay Dios mio is a widely used Spanish expression for surprise, frustration, or disbelief, and short clips of it circulate online as a quick reaction sound for memes and short-form videos. Because the phrase is instantly understood by Spanish speakers and recognisable even to many non-speakers, creators use it to add a dramatic, human reaction without subtitles or explanation. Like the English Oh My God Meme, it works best when the moment itself is already surprising, letting the voice carry the joke, the shock, or the exaggerated disbelief.