What's it mean "what's your deal?" What's "deal" mean here? Is it commonly used?

Native speaker’s answer
Rebecca
Here, "what's your deal?" means "what's your problem?" "Deal" means "problem" or "situation." It's an informal phrase used to ask why someone is acting the way they are. The phrase is commonly used this way! However, "deal" isn't always used this way. Similar phrases like, "what's the deal?" can be said to ask, "what's happening?" Ex: What's your deal? Why are you getting so angry? Ex: Then she asked me what my deal was because I was annoyed. Ex: What's the deal? Are we getting pizza or going to the movies? Ex: A: Go away. B: What's your deal? Don't be so rude.