To Brown Cap is to accidentally poop while attempting to break wind. The term generally refers to a sold turd as opposed to wet shit (see loose poopies, i.e. shart), that results from an over exerted attempt to fart. It can also reference an 'almost' turd beginning to be released while pushing a difficult fart, that's allowed to slip back into the anus.
Damn, I was digesting that t-bone an hour after dinner on the way to the Mozart festival. I lifted my left cheek, figuring my date wouldn't notice a crisp one, considering the road noise. To my surprise, I started to brown cap and almost lost control of the car. Once there, I double checked my boxers for tell-tale skid marks.
by Big Ed Moustapha March 18, 2009
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When someone tries holding back from pooping so long, that the end of the turd starts coming out of their ass before they can get to the bathroom.

Usually, causes skid marks in one's underwear...
"Damn! I am not going jogging again without taking a shit first. I was brown capping before I could get pff pf the trail"
by amos quito May 1, 2005
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When all of the body's energy is devoted to a not-entirely-successful effort at restraining the exit-seeking brown monster.

(Chocolate kissing the tighty-whities)

Brown capping usually occurs in heavy traffic jams
by Renaldo Wynn August 16, 2007
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When someone tries holding back from pooping so long, that the end of the turd starts coming out of their ass before they can get to the bathroom.

Usually, causes skid marks in one's underwear...
"Damn! I am not going jogging again without taking a shit first. I was brown capping before I could get pff pf the trail"
by amos quito May 1, 2005
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when you have to take a shit so bad that its halfway out of your asshole
"dude you excuse me for a minute, I'm brown-capping really bad"
"I know u are, I can smell it over here for real"
by tinyballin32 July 11, 2008
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To have anal sex without a condom, withdraw and let the chick lick the poo off your dick.
"Dude I gave this chick a brown cap last night"
"Your a beast man"
by Psychedellica February 3, 2008
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Erecting one's nipple, with the use of a semi-frozen, thawing piece of shit.
"After he was done, his nips were like the brown, brown caps of a Climate stricken Mountain"

"Yo' Boy got Capped"

-Not to be associated with the Montana Brown Cap reading facility for the homeless
by TheInfamousKennyJ August 20, 2009
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