A fork of Rural Dictionary
Then hand your significant other designates for the acting of fisting an orifice. Usually the hand designated for vaginal fisting.
"My wife got bored and wanted me to use my left hand as the catfist
The act of using your non dominant hand to masturbate so it feels like someone else is jerking you off
"It's a little weird when I beat it with my right hand. I can catfist with my left and pretend it's Betty White"