Top Definition
The next person in line that you ask to do something with after your preferred person isn't able to.
guy 1: "My girlfriend can't make it for lunch with me today...do you want to go?"
guy 2: "What, am I your back-up bitch?"
ayon kay RNPS ika-29 ng Agosto, 2007

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The girl a guy keeps leading on even if not entirely interested in her, as an ego boost or backup just in case the girl he really wants turns him down. Usually the girl he leads on has a crush on him, and is okay with being lead on, because she's still getting his attention.
She really liked him, but she was only his backup bitch.
ayon kay loveursteeze ika-01 ng Mayo, 2015

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Ur ho you keep on the side away from all your friends so you can move out of the state if shit hits the fan and you'll still have pussy to fuck
Person 1: hey what are you up to?
Person 2: fucking my backup bitch
ayon kay Pickabooo ika-09 ng Enero, 2007

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Person you invite to go somewhere when your preferred person cannot go. Can be male or female (non-gender specific).
"You can't make it? I better call my back-up bitch!"
ayon kay Rob Norment ika-29 ng Marso, 2007

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Two or more bitches in a group with a leader (usually a hotter chick).
If the hot chick wants to get in the face of a rival, she brings along her backup bitches cause she is too chicken shit to go solo.
ayon kay pmtm ika-09 ng Hunyo, 2010

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A bitch to bring as back up to an event such as a concert, party, etc... basically any social event, as insurance for getting laid incase the social event isn't providing bitches that are bangable.
Awesome guy one: "dude! let's go see def leppard and hit on some milfs!"

Awesome guy two: "i'm down but we better bring some back up bitches incase they all turn out to be cracked out moms."
ayon kay thesean ika-11 ng Pebrero, 2012

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BUB for short. It is what you call the girl that you are dating or messing around with that isn't your first choice or your second girlfriend
When Speaking in front of your BUB. Use the word bubby so that she feels it is a term of endearment.
Rick: So How are you and Patty?
Jon: Well you know she is my back Up Bitch (BUB). Waiting for Jen to be single
ayon kay liquidtuna ika-14 ng Disyembre, 2009

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