Top Definition
A sexercise machine loosely based on the tv infomercial sensation, the thighmaster, with the addition of an interchangable dildo.
My girl just got one of those new GuyMasters...man that's not your momma's exerciser! It was as much fun for me to watch as it was for her to use...I think I'm gonna get one for myself!
by Double DD March 28, 2010
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