by john January 19, 2004
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.
by Iambetterthanu February 14, 2008
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
by Brown Fist October 06, 2003