Manbound Share definition Flag A Manbound is something a man must do when he does something that could be considered feminine or gay. It is like a rebound that only a man can do. Oh shit, I just was just talking really gay on the phone to my girlfriend and my roommate Big Joe overheard me. I have to manbound by chugging a beer. Manbound by tiger3420 March 9, 2009 Get the Manbound mug.