Koseki Bijou is a VTuber with Hololive English, part of the Advent generation that debuted in 2023, and fans know her by the nickname Biboo. Clips of her streams circulate widely on YouTube, TikTok and fan channels, where short outbursts are cut out and reused as reactions. This line became handy as a standalone sound because it needs no context to understand and reacts directly to movement on screen. Its brevity and recognisable voice keep it in rotation for fan edits and meme compilations.