1. Bringing your lunch to work or school in a brown "paper" bag. 2. A dirty t-bag, normally performed after anal sex or a long days work. 3. Placing a brown paper bag over your sexual partners face, due to ugliness or to better fantasize.
Dude: Im brown baggin today! Damn snack machine always eats my dollars
Woman:Oh god, what are you doing? You never go ass to mouth!
Man: Im brown baggin your pie hole, leave me alone lunchbox
Woman:Why do you always brown bag me before we have sex?
Dude: I like thinkin about your sister..
To drink an alcoholic beverage while is still in the brown bag supplied by the seller. Reasons to do this include, but are not limited to: discreet drinking, hiding of girly drinks to avoid embarrassment, to get more drunk than would be socially suggested (by hiding harder liquor), and to promote humor value of drinking. Can also suggest bringing alcohol to a party as to have an alternative to undesirable beer.
"Dude, I just got a keg of Natty for Saturday. You gonna come?" "Sure, but I'll be brown bagging it though."
"Hey, you brown bagging a Zima over there, or what?"
Sometimes you meet a girl with a body like there's no tomorrow but a face like a mangy dog. Don't let that body go to waste and let her hideousness stop you from fucking her though. Just draw the smiley face on a brown paper bag, place it over her head, and fuck away while keeping your composure and piece of mind.
When a guy stupidly wipes his ass from back to front and does with too much vigor which results in smearing plop on his nutbag, thus giving him a brown bag.
"Dude, I was drunk and wiped back-to-front. It was more viscous than I had initially anticipated, and well, I wound up brown baggin' it."