With no clear single source attached to this short clip, it circulates mainly as a French internet reaction sound, shared in memes, edits, and chat-style videos where a quick spoken put-down does the work of a caption. The phrase itself mixes everyday spoken French with mdr, the French equivalent of lol, which helps it read instantly to French-speaking viewers even without context. Its staying power comes from that everyday familiarity: lateness and slow replies happen constantly online, so creators keep reaching for a brief, recognisable tease that lands in under five seconds.