This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Present participle of fist.

n. The sexual practice of inserting one or both hands into the vagina or rectum of one's sexual partner.

"The sex act called fisting is a source of confusion and misconceptions for many Christians."

fisted    fisting    fists   

hand    mitt    manus    paw   

clutch    handwriting    hand over fist    bunch of fives    ductus    fist-size    punch    knuckle   

hand over fist    fistful    iron fist    tight fisted    rule with an iron fist    fisticuff   

fisted    fisting   

Liszt    assist    cist    coexist    consist    cyst    delist    desist    dismissed    enlist   

finger    paw    palm    chest    jaw    knee    grip    wrist    forearm    elbow