1. Act like a bitch, and shut the hell up, calm down, and do whatever the fuck you are told to do.
2. Used in Prison Slang "bitch up" means to bend over, spread legs, and take the position a female regularly would, in order to proceed in intercourse.
1.I once told my dad to "Bitch up", and he bitch slapped me across the face.
2.One inmate said to antoher, "Leroy, you better bitch-up, you gonna have some lovin' like you aint never had, and sho' 'nough better not fight it, Or i will kick yo' ass."
by Kate-Lynn July 04, 2005
Similar to "man up". Used to tell a female not to be afraid to act like a bitch and be brutally honest and forward.
Female: "All these tools at the club are just NOT getting the hint."

Friend: "Stop being so nice and bitch up!"
by faji_tama July 28, 2010
Get ready to seduce a person in order to get what you want. Pretty much like Barney's "suit up" in HIMYM.
When you're pulled over by a police officer, you bitch up so that he won't give you a ticket.
by Suser April 04, 2011
when someone does push-ups/sit-ups like a bitch
you're doing those sit-ups like a bitch, they should call them "bitch-ups"
by armedlove October 04, 2010
When a girl needs help from her friends in doing something cruel or nasty to someone else. A form of 'back-up.'
Ex1: OMG, that skank Lesleigh will not get off my boyfriend. I'm gonna go tell that ho off, will y'all be my bitch-up?

Ex2: I'm gonna need bitch-up, this guy just won't leave me alone and I'm too nice to tell him to go away.
by K-Fig May 15, 2008
wussy; playing like girl; to girly like
Dog you played that just like girl or a wussy.
by Suds December 31, 2004
what happens when bitches meet and sparks and fists fly
Kelly from the mail room and Jenny from distribution had words yesterday and it became such a bitchup that they called the cops.
by isbourne November 07, 2014

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