The phrase is Russian, and its literal meaning is 'are you a crucian carp or who?', a deliberately odd way of questioning what someone is doing. As a sound, it circulates as a short, standalone reaction clip rather than as part of a longer song or scene, which makes it easy to drop into edits without explanation. Russian-language meme creators use it to mock confusion, strange behaviour, or a failed attempt, and its appeal comes from the mismatch between the everyday fish comparison and the situation on screen. That brevity and absurdity keep it reusable across many unrelated videos.