The phrase is everyday French for asking whether an event is on, and on TikTok it became a reusable sound for the same kind of uncertainty. Short clips use it to frame a question that viewers already understand without translation, especially when the joke is about waiting for confirmation. Its appeal is its directness: one question, one day and no need for extra context. That makes it easy to reuse across scheduling jokes, sports fixtures, parties and meetups, whenever the plan itself is still undecided.