What's (someone's) problem? phrase spoken informal
Used to express that you believe someone is being unreasonable.
Jack, what's his problem? The kids just asked him about his girlfriend, and he flashed out.
I ran to greet him, and he landed a punch on my chin. What's his problem?
Used to tell someone to go away and stop bothering you
1. That's a bit more expensive than expected.
2. That's rather unfair or untrue.
Used to express something bad is happening again
Here we go again! Lisa has just asked to borrow my new dress.