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the action of seeing or hearing something so awesome that you grunt like a rutting bull.
I was listening to dubstep the other day and the bass drop was so filthy that I had a brain gasm! ARRRRUGH!!!!
An unintentional orgasm without any real stimulation so it's all in your mind.
"Oh emm gee. I totally just had a brain gasm while laying down infront of the fan watching t.v."