Top Definition
Commonly thought of as merely a slang term for penis, the "Cum Pumper" is actually responsible for regulating the number of "pumps" a man feels during orgasm.

It is advisable for men to give at least a five minute rest between orgasm and urination in order to avoid unnecessary stress on the Cum Pumper.
Me, after sex:"Oops, I forgot to wait five minutes before urinating; now my Cum Pumper is gonna go to shit..."
by Huevon June 17, 2010

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