look up any word, like sex:
 
1.
Masturbating while taking a crap

(is possible for women as well as men)
Guy1: Dude why were you in the bathroom for so long?
Guy2: I just masterbrowned.

Guy1: What is that?
Guy2: It's when you're masturbating...And you take a crap at the same time...
by trooperm&m&m April 03, 2011