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present participle and gerund of fist examples
plural fistings
(slang) The sexual practice of inserting one or both hands into the vagina or rectum of one's sexual partner. quotations
[…] and comes to a climax of sorts (sorry) with – and here the more sheltered among you should avert your eyes – a girl-on-girl fisting scene.
2003 August 17, Sean O'Hagan, “Sex on the brain”, review in The Observer, page 5