Going and doing something behind someone elses back without the otherone knowning for some time.
<guy> im gonna kill that horse.
<gurl> im not. I dont harm animals
<gurl> -kills the horse without the guy knowning>

or

Telling someone something then going around saying it to someone else about a bestfriend when its not true which is back-stabbing them
by tUr0k December 28, 2009
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Texting or calling a mistress while having sex with your girlfriend or wife in the doggystyle position. Since you are behind them, there is no way for them to know.
Jim: Hey Matt I heard you hooked up with jess last night.

Matt: Yea, I had to back stab my girlfriend Tracy to set it up though.
by It Was Written February 9, 2010
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Someone who betrays you in a way that profits them, but leaves you out in the cold. They could have acted as you friend or loyal business partner initially, but took an opportunity to screw you over royally.
I thought we were close until that back stabbing buttfucker ran off with my girlfriend.
by assholeBrubaker March 18, 2010
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Someone who is one of your best friends, and then they go and tlk shit bout you to your bffs.
-saxby
"that back-stabbing bitch was tlking about you today"
"dude wtf?????"
by guess who bitch. December 16, 2011
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Bascially a woman, be it a friend or a girlfriend, or even someone you barely know, who stabs you in the back a bitchy way. Someone severely looked down on.
She is such a back stabbing broad, I let her stay at my house for one night and she already made a pass at my boyfriend.
by toee May 16, 2006
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Someone that you have grown to be really close friends with, but then they go and go behind your back and betray you when you are not looking. Normally they look really ugly, are hustlers and for some bizzare reason, they all seem to be called "Mehmet".
Look, there's the back stabbing Hussain that asked a colleague to wear his blazer inside-out so that he could come from behind and screw him over..
by AndyParrellFX September 8, 2010
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