Start by pulling your opponents pants down and then spit on your fist and ram it up his anus. Once inserted, proceed to ram your whole arm up, twist your arm 90 degrees and then pull out, try to grab as much shit as possible. Now slap your opponent and give him a forearm smash.
This technique is a real crowd pleaser and always works with the ladies.
In my fight with Rodney, I finished him off with the Anal Arm Attack.