knuckle bomb 

shitting in a girls sauce pan and living it on simmer because she wont drive you home after having sex with her

Steve left with some chick last night who refused to drive him home after having sex so once she passed out he knuckle bombed her and walked home

knuckle bomb by B.C.051 March 13, 2010

Knucklebob 

Fingering your bootyhole or the bootyhole of another with your middle finger up to the third knuckle.

Beth was squirming last night when I did a little knucklebob.

I can’t shit today. I knucklebobbed myself last night.

Knucklebob by Eaton Holgoode October 6, 2017

Knucklebomb 

Anal Fisting

Sebastian could really feel Tristan's fist in his ass. As he came, he thought this was the best knucklebomb he ever had.

Knucklebomb by Fnspidey August 31, 2017