Top definition
slang for a male scrotum, satchel, sack or testicle holder
Charlie, I can see your brain bag, please put your leg down (whilst wearing baggy shorts)
by JJ Ephus August 12, 2005
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The vengeful act of crapping on a lover's chest while they sleep.

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2
Brainbag is a carry-case for a laptop computer. Brain represents artificial intelligence of a computer and bag- you know that!
My laptop is to heavy to be carried without a brainbag!
by Goran Jevtic KG FILUM January 06, 2008
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