When you do something incredibly stupid by mistake. An obvious mistake that should for a task that's usually very simple.
Fernando: I was making cheese and crackers with salami but I put peanut butter instead of salami. Brain fart!
Josh: Yeah. Brain fart! And you're usually very smart.
An entirely new stage of confusion. It's like having a "brain fart" except for a breif moment you can not remember anything. Your brain feels like it has shut down becuase one thing is so difficult to understand. It leaves you in a whole new state of confusion and befuddlement.
The problem was so hard it left the kids brain farted.
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.
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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?
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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
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The inability to remember something.
What's that honey? Our anniversary date? Sorry, I think I'm having a brain fart!
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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."
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