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1.
One who becomes sexually excited by flashing or mooning someone else, hence, exhibit.
Chick 1: I just flashed the guy at the bar and got sooooo horny
Chick 2: You're such a sexhibitionist!
by cougz4evs November 28, 2009
 
2.
One who engages in sexual activities in public or who becomes aroused at the idea of the occurrence
1. Harry likes to bonk Sally in the waiting room at the dentist. He's a sexhibitionist.
by thedorkfromdownunda December 12, 2011