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8.
When someone does not perform an action that obviously should have been done, especially when you are under pressure and must think quickly.
Phillies fan: "Dude, Rod Barajas had a brain fart last night! He should have blocked the plate instead of standing up!"

Mets Fan: "That's not a surprise."
από DW5 26 Μάιος 2007
 
9.
The inability to remember something.
What's that honey? Our anniversary date? Sorry, I think I'm having a brain fart!
από Henry Harmison 14 Ιούλιος 2008
 
10.
A total lack of recognition.
A silly mistake.
Can be stress related.
"I had a total brain-fart when she asked for my number."
από Fish 15 Οκτώβριος 2004
 
11.
An involuntary release of stupidity. Usually at the least opportune time.
Fred had a momentary brain fart and forgot that he left his term paper at home.
από Lalina 12 Οκτώβριος 2009
 
12.
A sudden lapse of memory or judgment usually the result of ass gnomes dwelling in your mind cave.
Person 1: Hey baby

Person 2: What!?
Person 1: Oh sorry I thought you were my girlfriend
Person 2: what im a guy!
Person 1: uh errr (realizes it is unmistakably a guy)
Person 3: Don't get upset, it appears he is having a "brain fart"

Person 1: A brain fart?
Person 3: yes a brain fart, see they happen when ass gnomes dwell in your mind cave, causing disruption to your brain juice
από Thecaveofgreatness 21 Αύγουστος 2010
 
13.
momentary mental lapse as when you see someone familiar but forgot their name the instant you were going to say hello
Lover 1 Susan: Oh John that was sooo good!

Lover 2 John: Ohhh yeah, uh, rats I just had a brain fart. Damn what's your name again?
από no1sandman 31 Ιούλιος 2010
 
14.
1. When someone knows how to do something right but at that instant he does it wrong even though he is pro at it.

2. When someone is thinking of saying/doing one thing but does the other.
*You are driving on the freeway and you knew you shouldve takin the 110N exit but you took the 110S for some reason*

Your friend: Dude I thought you knew you had to take the 110N
YOU: Ya I did, just had a freakin brainfart.
από Abdel Hafiz 6 Ιανουάριος 2008