To insert a clenched fist into a sexual orifice for the purpose of gratification for the receiving party. A variation on fisting and not to be confused for synonymous with that act. There is tenuous precautions deliberately taken to prevent injury or pain. The possibility of pain and the borderline thereof typically aids in the gratification of participating parties.
Kristen Stewart: Are you ready for my whole fist? I'm going to be punching you right in the pooper!
Robert Pattinson: I was born ready, sweetheart.
"I like punching my partners, it adds a bit of spice to our relationship." - Chris Brown