The French phrase simply means that a username has just joined the team, and the clip circulates online as a ready-made multiplayer notification rather than as a line tied to one famous scene. Soundboard users share it because the wording is instantly understandable in gaming, streaming and group-chat contexts, even when the name itself is left as a placeholder. That flexibility is part of its appeal: editors can treat it as a welcome cue, a team-up signal or a running joke whenever someone new arrives, without needing any other context to make it land.