punch in the pan

A playful punch to someone's backside in order to know if they have enough padding around their lower back and rear to not be hurt by it.

"Hey Frank, I'm gonna give you a punch in the pan ...for science."

Punch in the Piss Pan

The act of inserting a fist into a vagina. Aka Fisting

SKÖL Bro: Did you hear that Rich gave his sister the old Punch in the Piss Pan.

SKÖL Ho: NO SHIT!!!