After blasting a chick in the ass and you pull out with a little bit of shit on the tip, tap your tip on to your partners forehead leaving a little brown spot, aka nickle on the forehead.
"Yo, man, this chick wasn't acting right while I was doing her in the ass, so I pulled out and gave her a brown nickle."
by BigT8 February 16, 2009
Get the Brown Nicklemug.