fisting / fist-fucking:

Inserting an entire hand or fist into the vagina or anus of a partner; humorously defined as: finger-fucking gone awry.
See Also: FFA, fico, fist-fuck, fist-fuckee, fist-fucker, fist-fucking, fisting / fist-fucking, fuck-fist, handfucking, punch fucking, spit-fuck, the bird / the birdie

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