The phrase is a familiar Brazilian Portuguese way of teasing someone who is suddenly moody, irritable or dramatic, asking what could possibly have bitten them to cause the change. Online it circulates mainly as a short reaction audio, shared in WhatsApp conversations and reused in funny short videos where the speaker's mood is the joke. Searches for the full phrase and for 'what animal bit you' show people look for it specifically as a punchline, and its everyday wording keeps it easy to reuse across different situations.