Ballpumping forces fluids into different tissues at different rates. The testicles enlarge faster than the sac, just as the core of the cock enlarges faster than the skin. So if you pump a short session, you'll get big eggs hanging in your sac. If you go for a real long session, you'll get a big bloated "grapefruit" sac.
by deftonepiper August 31, 2008
The sexual act of pulling your arm back and punching your fist up your partners anus in a celebratory manner. The arm must be inserted up to the elbow or it is only considered a Bill Murray swirly. This is usually accompanied by a reach around.
by Pope Big Ron Don John II December 31, 2022