This sound is widely used online as a quick shocked reaction, especially in “pause” memes and edits built around awkward or suspicious timing. The exact original source is not clear from the available details, but the phrase spread through meme culture as a short vocal sting for disbelief. It remains popular because the delivery is immediate, recognizable and easy to sync with a freeze frame, zoom or another reaction cue like awkward moment or WTF BOOM!.