An unwarranted interjection in an otherwise controlled environment.
Teacher: So you see, we now have only three weeks before the biology exams.
Student: That means I will only have three more driving lessons before my driving test.
Teacher: Uhh.
Student: Sorry sir, just a bain-fart.
by John Boon April 23, 2005
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!"
by Lemon Pie July 10, 2008
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.
by Whoohoo December 20, 2007
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.
by Kuatolives February 25, 2007
"If Ya Don't Stop Thinkin
Ya Brains Gonna Be Stinkin"
nojjhjhhhhhhh dfdf brain fart. fdf f ffdgfggdggffgffgdf fggfgfgdff
by MJ cvghfgjghf March 24, 2007
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
by jake fool May 13, 2007
A spontanious thought or creative idea.
We were discussing the campaign when i suddenly had a brainfart.
by Keith Wijnkooper April 09, 2003

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