The masculine practice of enlarging the nads and ballsac, using negative air pressure to force more blood and lymphatic fluids to flow into the scrotum. Practitioners, called ballpumpers, wear a jar or specially designed cylinder over the genitalia and withdraw some of the air using a pump, thus "pumping" up their basket.
I had a great ballpumping session last night - got to 16" around! Barely fit into my jeans this morning!
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