1 definition by BtotheRtotheItotheAtotheN

A temporary condition usually caused by a blow to the head, or the consumption of too much Alcohol, resulting in the inability to remember a Goddamn thing.
" Dude, I had such a Brain Sprain last night, that I forgot everything! "
by BtotheRtotheItotheAtotheN September 15, 2012
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