A mood, common among females, describing bleak and angry views on the world. This is most often associated with that certain time a month, or just with someone (male or female) who is being a bitch.
Synonym- Pissimistic (someone who is always really Pissed Off)
"Excuse me miss, would you donate to dying children in Africa?"
"Go fuck yourself. They'll die anyway, so what's the point?"
"Well you can save them, you PMSimistic bitch!"