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A state of mental confusion or forgetfulness that lasts longer than a brain fart or brain freeze. Can last daze (sic) to years.
Grandma seemed to be in a brain fog for a couple days last week.
by yes juanito yes March 06, 2015
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When you have such and amazing orgasms or set of orgasms, that your head feels like it is in a fog and you can't think straight.
Dude, my girlfriend has Brain Fog, she just got up after sex and walked into my wall.
by jkuile June 10, 2009
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