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1.
A sporadic, random and unintended remark discharged orally as a result of the mind's need to facilitate a release of bottled up thoughts.
Her proclamation was a mindfart and made no sense whatsoever.
автор: Justified Existence 22 октября 2004
 
2.
When you know what you were about to write down or say... Only to forget it and loose all train of thought.

Verb - stemming from the root idea of a fart being "just air and nothing good coming out"
"I was in the middle of an exam, and just had a total mind-fart"
автор: Kt3 19 октября 2007
 
3.
A long and drawn out version of something simple.
We did one problem for four hours, when I had the answer at the beginning. It was a total mindfart.
автор: Eric 15 июля 2003