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It means anything you want it to. Absolutely anything. It's usually used to get out of unfortunate situations, or to just be a dick!
Wife: Honey, do you wanna have kids?
Husband: Barbar.

Innocent Man: PLEASE, I'LL DO ANYTHING AS FOR YOU TO NOT KILL ME.
Dick: Barbar.
Innocent Man: Huh D:?
Dick: *stabs*
by Underalilactree June 21, 2009
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A shortened and more pleasant-sounding version of the word "barbarian". Used to describe someone who lacks manners and/or common sense. The term is used to refer to people who may be in earshot but probably won't know the word's meaning. Could also mean stupid, foolish, messy,
My god, look at that girl cramming food in her mouth. It's all over her face and her shirt, she's a total barbar!
by Styrofoam Boots August 09, 2008
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