An ex-lover and/or girlfriend, wife, or other relationship in which the female no longer plays a positive role in your life.
Guy 1: Hey, guess who I saw the other day.
Guy 2: Who?
Guy 1: The Beast.
Guy 2: Really? I haven't seen my beast in a while.
OR
Boy do I feel sorry for the guy who's beast I had sex with last night! She's a keeper!
A Collective made up of lazy girls that have no future, but are still killin' the game harder than you.
A Beast resembling a taco originates from small parts of mexico.