literally every fifth grade joke.
Recess Monitor: Put all the balls back into the cart!
Fifth grader: *cringe smile* hmmmm..... what kind of balls?
Two big phat wrinkly lumpy spherical shapes connected to each other via skin, located under at a random but not extreme distance from the cock.
Cum is stored in the balls.
Billy "IM GONNA CHOP MY BALLS OFF !!"
Bob "NO BILLY PLEASE !! YOULL NEVER CUM AGAIN !!"