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1.
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

Words related to brain bag

sack satchel scrotum
 
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