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This is the process of inserting a whole hand and arm into the anus (much like fisting) when the hand and indeed first is far enough up. the anus - the person can then rapidly open and close the fist- thus making a flicking motion and taping the spleen.

This is said to be enjoyable and sexualy arounsing.
Fist me and then spleen flicking
by gay bandit May 08, 2006
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