The clip comes from WTF, the dance single by French DJ Hugel featuring British singer Amber van Day. The track built its hook around the repeated exclamation, which made the vocal easy to isolate as a standalone reaction sound. Short excerpts later circulated on soundboards and in edited videos, detached from the full song and reused whenever a scene called for instant disbelief. Its popularity as a meme insert comes from that clear, recognisable phrasing and the energetic production behind it, which keeps it identifiable even in very short edits.