A moment when you just forget something even if you ran through it a moment ago.
person1: What's that?
(points to chair)
person2: Uh, Uh...
person1: BRAIN FART!
Adeladaine tərəfindən 20 Mart 2009

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When someone sits on your ear while you are sleeping and farts. Usually done as sick pranks at late night parties.
Richard "Dude I just gave Brad a Brain Fart!"
George "Dude that's nasty!"
Brian "SWEET jesus!"
Lemon Pie tərəfindən 10 İyul 2008

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when a computer freezes or starts being dumb. or any one who has a lapse in judgment.
Damn. My computer had another brain fart.

I can't believe Jacob did that. He must've had a major brain fart.
Whoohoo tərəfindən 20 Dekabr 2007

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An incredibly bad(smelling)idea that leaks out of someones head, although these bad ideas can be easily avoided through basic common sense, The term "brain fart" is mostly associated with unavoidable bad ideas that originate from a boss or employer.
Bob's boss looking rather proud leaks out a rather large and foul smelling brain fart by telling Bob "you will have two week work deadlines at the beginning, middle and end of each month".
Bob can easily identify this as a brain fart from the really bad smell and since 2 weeks of time would not exist inbetween the end of one month and the beginning of another.
Kuatolives tərəfindən 25 Fevral 2007

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"If Ya Don't Stop Thinkin
Ya Brains Gonna Be Stinkin"
nojjhjhhhhhhh dfdf brain fart. fdf f ffdgfggdggffgffgdf fggfgfgdff
MJ cvghfgjghf tərəfindən 24 Mart 2007

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Commingly meaning to think of something after the fact for example after a fight or in class with an answer and forgetting
Person 1: oh crap i coulda called him a dickhead
Person 2: wow what a brainfart
jake fool tərəfindən 13 May 2007

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A spontanious thought or creative idea.
We were discussing the campaign when i suddenly had a brainfart.
Keith Wijnkooper tərəfindən 09 Aprel 2003

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