1 definition by Santhony

Top Definition
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.
by Santhony January 02, 2010

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