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Fisting someone anally very deep. Beyond the elbow.
Some gay men (with practice, patience and lots of lube) can take the whole arm into their rectum.

The fistee's internal layout has probably been squished around and stretched by regular use.

The fister has to be skilled to navigate their arm around the bends and constrictions of the descending and transverse colon.
Check out the movie 'FFucking FFantastic' .

The redheaded guy with the glasses is being fisted bicep deep.
by JLC01 June 13, 2010