Top Definition
A man who regularly vacuum pumps his scrotum to enlarge the nads and the sac. Ballpumpers are usually also cockpumpers.
Look at the bulge in that guy's jeans! He must be a ballpumper.

That old guy is either a ballpumper or his ticker's not up to the task of clearing edema.
by Tigerdave September 11, 2008
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