Shitty mood

Having a bad day.
Someone who is not in a good mood.
Someone who is pissed off.

A: Hey, man!
B: 'Sup, dude?
A: I'm in a shitty mood right now😩.

B: Someone pissed you off or you're only having a bad day?
A: Both!
B: Yea, I know how you feel.