Catcher: Holds anus opens and attempts to catch the punched testicles in their butthole.
Receiver: Gets their balls punched.
Pitcher : Puncher of nuts.
The catcher bends over and the receiver stands behind them in a doggy-style-like position and then gets their balls punched by the pitcher into the held open anus of the catcher. The catcher than tries to catch the testicles in their anus before they swing back.
"Sure, but i'm pitchin! I aint bein the receiver like last time!" - person 2
"I call dibs on being receiver!" - Idiot
(Exp.2) BITCH SHUT THE FUCK UP BEFORE I GIVE YOU BUTTBALLS!