The phrase itself is everyday German for asking whether someone is already in, and online it circulates mainly as a short, reusable meme sound rather than as a clip tied to one widely documented scene. Search interest clusters around several close spellings, including 'ist er schon drin' and 'bist du schon drin', which suggests people arrive looking for the exact wording they heard in a video. That flexibility helps it travel: the same line fits entrances, reveals and innuendo, so creators keep reusing it in short-form edits long after first hearing it.