This clip comes from Filian, a popular VTuber known for energetic streams and short, quotable reactions that fans clip and share across soundboards and social media. The phrase but not that big works because it is instantly understandable, even for viewers who have never watched her streams, and it fits almost any moment of deflated expectation. As short VTuber reaction sounds continue to circulate in memes, edits, and stream highlights, this one stays useful precisely because it is brief, clear, and easy to drop into a joke.