When a man masturbates and pinches his foreskin whilst ejaculating, filling the foreskin like a cum ballon, then flicking the cum filled cock balloon at someone like a David sling.
When a male puts his testicles up a females (or another males) anus, the receiving female (or male) then proceeds to squeeze out said testicles, as if having a poo.
Pleasureable for both parties involved.
Like Tea Bagging, but anal...