look up any word, like darude - sandstorm:
 
22.
One who listens to your problems, pretends to be your friend, acts so fake around you you actually believe it, but in the end goes and hooks up with your boyfriend, spreads rumors about you, etc.
Amelia hooked up with him? I thought she was her best friend! What a backstabber....
by xxxxxooooo69 February 02, 2011
 
23.
Someone who talks shit about you behind your back. If you were on fire and this person had a bottle of water they would rink the water and apologize about it later when you are in the ICU. This person makes you walk on hot coals to please them and then they turn around and talk about behind your back while still acting like your friends...stay away from theses people they are no good.
Good Friend: "OMG sorry i didnt mean ... is there anyway i can make it up to you?"

Bad Friend: "Nah.. it's okay it's fine, don't worry about it"

1 hour later
Bad Friend: "guess what this bitch did to me..... I have always hated her. all she wants is attention.. she should go die in a hole"

Next Day

Good Friend:" Hey Bestty"

Bad friend:"Hey Bestfriend in the world" -.-

Another person: "You do know she talks shit about you behind your back"

Good Friend: "WHAT A BACKSTABBER!!!"
by Don't Hate, Appreciate January 30, 2012
 
24.
a friend who is your best friend for like a week and then finds some people who are cooler than you and likes them better than you. then she shares time between you and the other friends and decideds when thier gonna sit with you at lunch
alana found more popular friends and became a backstabber to her math club friends
by mushka midnight March 08, 2007
 
25.
The act of knifing a player on your team in the back while playing hardcore cod. Just to piss off your friend who doesnt realize your backstabbing him.
-How the hell do I keep dying?

-Dude, that asshole on your team keeps backstabbing you.
-Your right! What a fucking back-stabber!
by CODbackstabber March 15, 2011
 
26.
buttholes, jerks, mean people, people who you should drop instantly they will never be able to trust, people who you think are your friends but are only going to 'stab you in the back'.
J- she is such a backstabber, i told M i liked him and now she is talking to him.
by dabeast. January 26, 2011
 
27.
The act of back-stabbing is not a difficult task.

It is to earn someone's trust, by becoming their "friend" or otherwise, and then break it repeatedly.

It's easy to tell who's a back-stabber and who's not. If:
1. They talk bad about somebody else that they seem to be close with,
2. Many people don't associate with them for the fear of being talked about,
Or just seem like a bitch in general, watch out. These are sure signs.

Just a few examples of back-stabbing are if they:
1. Tell everybody in your grade that you are pregnant.
2. Talk behind your back about your strange behaviors after the death of you dad.
3. Hit on, go out with, and be a total slut to the man you clearly like, and that she has bad-mouthed repeatedly in the past.
4. Start numerous rumors about how much of a "fuckin whore" and a "piece of trash" you are.

After this, they will most likely come back begging for your loyalty to them.
This, in some cases, is acceptable. But be careful, it's bound to happen again.

~ ~ ~
"Woah, dude, did you hear that Lauren's pregnant?"
"Nahh, man, that back-stabber Annika's just starting rumors."
by NvRShTNvR97 May 10, 2010
 
28.
backstabber, a person pretening to care about you but causes you downfall in future.
For example:

annie: thanks
backstabber: No problem friend!

------ 5 days later -------

backstabber: I always hated you annie!
annie: but you said we were friends...
by mya causero January 03, 2014