auto-fisting:

Uncommon practice of inserting one's-own fist into one's rectum.
See Also: anal fisting, analism, auto-fisting, autohedonia, automatic muzzle loader, brachioproctic eroticism, brachiovaginal eroticism, bunch of fives, FFA, fist fucking, fisting, five of clubs, fuck one's fist, fuck the fist, fuck your fist, handballing, handfucking, wearing brown gloves

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