Circulating mainly as a short soundboard clip, this German phrase is used by creators who want an open-ended setup rather than a finished joke. The wording translates roughly to what do we do when, and that unfinished structure is the point: it invites a cut, a reaction, or a punchline that the listener does not get from the audio alone. In prank and meme edits it often appears at the start of a scene, where its questioning tone signals that something unexpected is about to happen, which keeps it useful across different videos.