When fisting someone anally or vaginally, placing one’s penis into the fisting hand and masturbating into the anus or vagina being fisted while continuing to fist. The entire fisting hand and penis are inserted into the anus or vagina.
Shawn fisterbated Alex.
by LabelXM July 6, 2022
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Bill: What do you think those douchebags from "Jersey Shore" do when no one's around watching them?

Ted: Probably sit in front of a mirror, looking at themselves, fisterbating to awful techno music.
by JKyleM22 February 6, 2011
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A form of masterbation used by women inwhich they insert there entire fist / arm up there vagina.
Lissa, "When I get home I'm going to watch my favourite TV programme".

Amy, "When I get home I'm going to pleasure myself by fisterbating".
by Tom Hurd January 11, 2008
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Best accomplished with a partner with an enormous vagina; the act of jerking off while inside of her.
I'm telling you, this girl was so cavernous the only way I could get off was by fisterbating.
by Whitlash September 28, 2020
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