This sound is mainly used online as a Vietnamese reaction clip for denial, innocence, and fake shock. The phrase itself is common everyday speech, which helps it travel well across short-form edits, memes, and chat status videos. Creators keep using it because the meaning is instantly clear from the tone, even for viewers who do not speak Vietnamese. It fits the same reaction space as bruh or a buzzer, where a short audio cue quickly reframes what just happened on screen.