A guy who likes to shake his junk a lot. Especially while wearing loose fitting shorts so that their junk makes a slapping noise against their leg. This is often perfomed naked in front of mirrors.
Thelma: I caught Brad shaking his junk in front of the mirror when he got out of the shower.

Beth: OMG! He is such a cock flopper!
by mbaby13 December 18, 2009
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A fat or very ugly chick who causes stiff erections to flop.
Nicole is such a cock flopper no guy could ever keep it up around that slore.
by mbaby13 December 18, 2009
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When a women is extremely easy and you could "flop cock on the table" and turn it into a fun night.
I was at the bar yesterday when a cock flopper came out of nowhere. That night was crazy
by Virginityburgler69 November 26, 2017
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