Definitions by Santhony

HBM 

Hyper Bitch Mode
A synonym for PMS, premenstrual syndrome.

Guy 1: hey whats up?
Girl: blah blah blah fuck you!
Guy 1: what did i do?
Guy 2: don't worry about it man, she's just in HBM.
Guy 1: oh, alright then.

HBM by Santhony January 2, 2010