To take your colostomy bag and hit/pour it on another person
He was so mad at his boss that he brown bagged him as he left.
used jokingly with friends as an insult on them. used for fun and to get a laugh. in context of the woman in question is an absolute beast in every aspect; body face, etc. etc.
"dude look at her, thats all your bro get you some*laughs* "
"*laughs* hell no she is totally a Brown Body Bag Special"