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15.
1. 2 (also fist-fuck) trans. vulgar slang penetrate (a person's anus or vagina) with one's fist.

2. When a girl gets a fist shoved up her vagina. Hardcore 'fisters' will sometimes shove a fist up their ass.
When you go on pornhub and see the 'fisting' category

Person 1: Dude watch this girl get fisted!

Person 2: Holy shit that's impossible to do, i think im gonna faint...

Person 1: Look now!!! It's all the way in her ASS!!!!

Person 2: Fuuuuuuuuuuuuuuckkkkkkk...... *Faints*

Person 1: What... did you not like it? oh.........
by J.R.LG February 26, 2012
 
16.
when you stick your fist into someones pussy
1 wanna fisting

2no
by caelin moore December 04, 2011
 
17.
To punch with the part of your hand that's exposed or unpadded in MMA.
Dude Rampage was totally fisting when he dropped Chuck Liddell with that hook.
by MMATermCoiner February 19, 2014
 
18.
1) The act of pushing one's fist into an orifice. It gives the feeling of some gigantic cock, apparantly, and is popular amongst homosexual males.

2) Repetitive punching to a pressure-point, usually with some sort of aid.
Fisting causes stretching, prepare to be loosened!
by Gumba Gumba February 27, 2004
 
19.
A technical term used in relation to the husbandry of sheep, cattle or other domesticated animals.

Fisting is the term applied to the practice of inserting a hand into the vagina of a ewe (female sheep) or cow in order to assess the relative position of the foetus inside the uterus. Fisting may also be done in an attempt to assist an animal which appears to be having difficulty giving birth.

Verb - To fist
"We had a tough time fisting that sheep to get the lamb out last night."

"If you think the cow is having difficulty giving birth to the calf, fist her thoroughly to establish if the calf is too big or is malpresented".
by Zumoid January 28, 2010
 
20.
The act of inserting one's fist into the anus of another individual resulting in sexual pleasure. This act often occurs among homosexual males.
Billy began fisting Timmy during their orgy with Sammy and Tammy.
by Etrain November 28, 2003
 
21.
the act of penetrating ones rectum or vagina with a fist most popular with gays
Johnathan was fisting his boyfriend and he couldnt take it out
by im2dope December 07, 2008