when you stick a penis (or dildo) up someones ass for your sexual pleasure. this happens a lot with queers. but a man could stick his weiner in a womens ass or a women could stick a dildo up another mans ass. there are endless possibilities
me and your wife were butt fucking last night and thats why theres a white spot in her ass.
by butty fucker December 14, 2009
Get the butt fucking mug.
When an already lit cigarette is used to light another while they are in each person's mouth.
I don't have anymore matches.

That's ok, I'll butt fuck your cigarette and light mine.
by G-RED October 29, 2006
Get the Butt Fuck mug.
The action of lighting ones cigarette when they do not have a lighter by placing the cherry of a lit cigarette to their unlit one and inhaling, lighting the cigarette to smoke.
person 1:"Do you have a light man?"
person 2:"No, I just used my last match."
person 1:"Then can I butt fuck you?"
person 2:"Yeah, sure."
by Bailey Alison January 24, 2008
Get the Butt Fuck mug.
When you shove your hard penis up another man's ass. it really feels good. You should try it. Its when you have anal sex. Fudgepacking.
I had some butt fuck fun with my boyfriend Rehmeyer
by S, VITALE January 14, 2008
Get the butt fuck mug.
The process, sometimes an art, of two or more participants entering their member or a polymer substitute in the anal area - like a train in a tunnel.
by Up the bum is No.1 October 10, 2019
Get the Butt fucking mug.