foot fisting 

Verb: fütt fisting
Forcibly inserting one's foot into the anus or vagina of another.

Hey baby I just got a pedicure, now I wanna foot fist you!
Now get ready for the foot fisting of your life!

foot fisting by Weezerlungs December 2, 2013

Foot fishing 

When you're foot fisting and your prosthetic foot falls off and you try to fish it out.

"Dude, last night Jessica got down and dirty and I lost my foot in her anus, I had to go foot fishing"

Foot fishing by the soggiest bread November 16, 2015