The Nasty Jim is a move very similar to a dirty sanchez, instead of simply using just the fingers to penetrate the partners ass, the entire fist is used. The same principle still applies as the fist is still rubbed along the face and feces is still transmitted from the fist to the partners face.
After giving her a rough anal fucking, I pulled out and gave her a Nasty Jim just before I grabbed my pants and left
When you are feeling the lack of four days sleep, does bulbs and proceeds to stand up off of a half flat air mattress to do something and falls over and knocks over everything off of the table in front of him then settling down and repeating it again a few hours later......