The phrase is a common German expression of indignation, similar to saying that is outrageous or what a nerve in English. As a soundboard clip it has spread as a short, reusable reaction rather than as a quote tied to a confirmed film or show, and its appeal is the instantly clear tone even for listeners who do not speak German. Creators reuse it in memes, streams and group chats whenever a situation calls for exaggerated disbelief at someone being bold, rude or completely shameless.