Top Definition
When a man who cant get an erection when having intercourse.
Mike couldnt sh*g Sherry, cos he had a Mr. Floppy.
by Mr. Kill July 05, 2007
The name given to someone who gets a Friends With Benefits, but upon trying to copulate fails to get an erection
Tom: Hey did you hear about that Mr Floppy?
Christopher: Oh yeah that was pretty funny
Tom: One hour and couldn't get a boner, had to get a floppy handy
Christopher: AHAHAHAHAHA
by DO DA DOO DOO January 19, 2015

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