Definitions by Nayy.

buttfux 

Slang for the phrase "butt fuck." Or the act of "Butt fucking."

Taking it "up the butt" or anally.

Done in prison.
Texting term.

Jamal buttfux his male sexual partner John.
Omg. did you two buttfux?

buttfux by Nayy. December 6, 2007