‘啥事’ is an informal, colloquial contraction of ‘什么事’, meaning ‘what matter?’ or ‘what’s up?’. The character 啥 (shá) is a northern Chinese dialectal variant of 什么 (shénme), meaning ‘what’, while 事 (shì) means ‘matter’, ‘affair’, or ‘thing’. Together, they form a noun phrase used to ask about the nature or cause of a situation — often implying mild curiosity, concern, or impatience, depending on tone and context.

This expression is common in spoken Mandarin, especially in northern regions and casual conversation among friends or family. It’s rarely used in formal writing or polite address (e.g., with superiors or strangers), where 什么事 is preferred. Note that 啥事 carries a relaxed, sometimes slightly blunt or teasing tone — it’s not inherently rude, but register matters: using it with your boss or elderly relatives may sound overly familiar or dismissive.