1. Using a person as your friend but actually really hating their guts.
2. Using a person as your friend, and then ditching them for new friends.
"Oh my god, that girl such a backstabber!" She said.
"Yeah, I know, I can't believe she'd do that," The other girl agreed.
by Lying Lisa January 25, 2008
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A person who you will think is your friend, only to find out later that this person spreads rumors and lies about you to your other friends.
A roommate who fronts a nice demenor, only because the rent is cheap. All the while attempting to sabbotage your personal relationships for his own gain.
John: Wally, Sarah just told me what you said.
Wally: I don't know what your talking about.
John: Dude you suck, she just told me that you said that I cheated on her and had girls stay at the house.
Wally: I don't want to talk about this right now.
John: Dude you know you have a crush on my girlfriend, and your just trying to sabbotage that because you think she would date your wierd ass.....Fucking backstabber!
by jpwf August 19, 2009
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one who is friendly to you/others in your/people's presence, but will say negative things about you when your not around in a heartbeat. some people do it all the time, some just in moderation...

it's something that everyone is at least a little bit at some point in their/your life, just like hypocrites.
everyone is a backstabber, everyone is a hypocrite. almost pointless to even use these too words...
by y2c January 10, 2011
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all your so-called friends who turn around and screw you over
Until second semester our group of friends was close until everyone started dating each other, we found out who the REAL backstabbers were, thanks you guys.
by jlo June 17, 2003
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some one who says something to your face and another thing about you behind your back
NIALL:dude1 that song you wrote rocks i love it! im gonna write in on my dick so ill never forget it!
Dude1:ok cool but i gtg see ya!
Dude2: so niall what did he say
NIALL: oh he was being a fucking showoff about his song
Dude2: that song sucks though!
NIALL: yea i know man he fucking gets on my nerves
Dude1: Niall you backstabber
Niall: fuck off you lieing cunt! i dont fucking like you because your so arrogant!
Dude1: look in the fucking mirror and think
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A backstabber is a friend who says she will be there for you and look out for you not 2 worry .. She continues the act and then 1 day when you and ur boyfriend break upo she confesses 2 him she has a crush on him ..
Martha is the biggest backstabber of life
by Miszpinky February 1, 2006
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A malicious coward who deliberately betrays someone more honest and takes advantage of his/her insecurities because they can't grow up and deal with their own insecurities whilst feigining friendship with somewhat little effort while talking crap about you behind your back. They usually don't treat u as nicely as people they do like, and when they do they'll instantly be a dick/bitch to you again, make lazy and unlikely excuses when they would make the time if they could be bothered to even to tell how they really feel about you in a more obvious way. And they pay more attention to u when u stand up to their lame behaviour.
I'm tired of Les' very blatently complacent and treacherous atittude towards me, never listens to what I want, what a phoney backstabber.
by thrashnut86 November 26, 2010
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