The phrase is a common French expression used to call out someone who is behaving as if they own the place, roughly meaning where do you think you are. As a soundboard clip it circulates in French speaking meme spaces, where short spoken reactions are reused out of context for comic effect. Its popularity comes from how instantly recognisable the scolding delivery is, even to viewers who only catch part of the French. It continues to be shared as a quick reaction to arrogance, rule breaking or misplaced confidence in videos and chats.