To masturbate by inserting one's fist into one's own orifice or orifices. Artificial or disembodied fists may also be used. The word is a hybrid of "Fisting", "Masturbating" and "Sophisticated", and as such could be considered a sophisticated form of self-fisting.
"I wouldn't go in there Gavin, Tylah is Fisturbating."

Bryce: "Dan, if you don't sort that shit out my fist will be up your ass"
Dan: "I can fisturbate MYSELF!"
by Under Training April 27, 2008
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An individual that sexually gratifies themselves by self-fisting their own ass. May or may not be performed with a simultaneous wank of the genitals.
Wanking became too mundane for Carl so he turned into a fisturbator to get himself off.
by Eaton Holgoode April 12, 2017
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the act of being disturbed by the fact you are being fisted
sorry I didn't finish my homework teacher, my study partner fisturbed me all night long!
by Matt Huff October 30, 2017
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v. A variant of fisting in which you wank yourself inside a partner’s orifice as you’re fisting. Chiefly a gay anal sex practice involving the motion simultaneously stimulating the fistee’s prostate, but can also be vaginal.
“Fisting Robin was getting me harder and hornier, so I slipped it in and fisturbated”

“I want you to fisturbate and then punch your spooge deep inside me”
by NYCBill July 14, 2021
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