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Following someone into a bathroom, preferably into the actual stall, while at the same time taking your penis out. The idea is to catch the person unawares so that when he/she turns to sit down, your junk is in their face. An erection and/or wanking are optional moves.
That dude totally pulled a sneaky petrash last night at the ceremony and almost made her shit her pants.
by MVHSnonperverts June 05, 2009

Words related to Sneaky Petrash

atack dick jerking mark peter serrano sneak toilet