Anal Fist Fucking
Anal Fist in the traditional sense usually involves inserting the open hand into the anus. Once inside, the hand forms a fist shape and is usually kept inside. There will of course be some small gentle movements and wiggling back and forth, but the fist will remain in the anal cavity for the duration of the act.
Anal Fist Fucking however, can be thought of as something entirely different. This will often involve an Anal Fist motion to begin with, but once inside, the full fist is then actually withdrawing and inserting over and over again, in a similar motion to intercourse. This creates the “Fist Fuckin” motion.
Above are some examples of the Anal Fist Fucking Motion.