It is the act of inserting your finger in your ass and then inserting it in someone elses ear like a wet willy.
I Brown Willy my pal when im sas
by Smudgehat April 23, 2011
Just like a wet willy, but you stick your finger in your butthole first.
Maze gave Jon a brown willy, after he broke the rules of masturbation night.
by theSkiff July 08, 2009
when having anal sex doggystyle, you proceed to donkey punch your partner, then pull your penis out of their ass and stick it in their ear
While having sex with some freak< tony decided to give her a brown willy instead of a dirty sanchez.
by dirty bonz November 05, 2006