Shit on your hand or knuckle when wiping one's ass.
While wiping I got a case of the brown knuckle.

My roommate had brown knuckle on his finger.
by john January 20, 2004
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When some one wipes their ass and their thumb knuckle hits their asshole before the toilet paper does, causing them to have shit on their knuckle.
Tom had to use extra soap to get off the brown knuckle.
by Iambetterthanu February 14, 2008
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The failed act of fisting, due to lower intestinal blockage.
Jimmy want to fist his girl, but she was to full to engage, leaving Jimmy with a nasty case of the brown knuckles.
by Jimmy May 13, 2003
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Heather bent over amber, made a fist and gave her a brown knuckle.
by Brown Fist October 7, 2003
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This rare experience occurs when you are fisting a girl and your fist comes out brown, and you then realise that you were in her ass instead of her puss. It is usually bad news for all involved.
Mate1 - "Hey mate I was trying to fist a girl in the puss last night and I ended up with a bit of brown slut knuckle"

Mate2 - "oh well, there's plenty more fish in the sea"

Mate1 - "actually she liked it... bit stinky though"

Mate2 - "nothing a bit of shower in a can wont fix"

by bobby rooney May 23, 2008
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when you wipe your ass and miss hitting your knuckles instead....you get shit knuckle brown
by Tigerlily73_99 July 31, 2009
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