Ballbumpin'

The act of bumping ones balls to another persons balls.

I'll come to your party tonight,but it better not be a ballbumpin' party.

Ballbumpin' by Applecook July 18, 2016

ballpumping 

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!

ballpumping by tigerdave October 2, 2009