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1.
When you poop in your hands and smack someone's bare balls with it.
I had to wash my nuts because I got brown sacked.
by Ana Appelbaum November 23, 2009
 
2.
verb. To leave, to depart, to exit from, to get the fuck out of, to dip, to bounce out.
Dude, Jamie and i were about to have sex, but then i smelled her clam-like crotch and had to brown sack, so i went home.
by emoeed December 16, 2012
 
3.
The act of putting a males balls into his anus, then in due time allowing a partner to give them oral sex, usually resulting in a suprise.
When I brown sacked Gruumm he found the taste suprising yet satisfying
by KyleVFD August 17, 2006