Can happen accidentally during ferocious docking or by intent. Dong pool is when you power thrust your dick into your male partners nut sack effectively knocking one ball into the other ball and causing the latter ball to launch back into your partners butthole.

Hint:
Try this move in an all male foursome in lieu of the classic pool game “eight ball”. However the goal is still the same. Knock a pair of balls into someone’s butthole with your dick!
“Hey babe, I’m going to go play some dong pool with the bros after the Luke Bryan concert. Don’t wait up!”
by Sven’s D May 28, 2019
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