The mystical art of Punching your girl (generally in the kidneys from a Doggy Style position) just as you and/or her are about to cum.
John : How did it go with that hot girl last night mate?
Jim : Yeah I fucked the shit out of her, and right before climax, I gave her the old Cum Punch.
John: Ha ha, never fails mate! Yeah your Mum likes that shit too.
Jim : Oh Dad, I dont wanna know that!