The phrase itself is everyday German for you saw it, too, and that plain, conversational meaning is what gives the clip its appeal online. Because it is only about a second and a half long, it works as a quick reaction sound that can be dropped into memes, short videos and chat replies without breaking the pace. Creators tend to use it when the visual evidence is already clear, letting the voice do the accusing while the picture does the proving. Its appeal is in that shared understanding between speaker and audience.