One who rides the asses of other men. As in one who inserts a penis or vibrating dildo up the butt of another male. For fun. Oh my. Homo, anyone?
That little manslut buttfucker gave me his big one! He just grabbed my ass and rammed Johnny Horn over and over until he sprayed his gayness all over my butt.
by ArcticFox January 3, 2004
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Could be a reference to an annoying or self absorbed person who could either be bragging far too much or putting others down in a manner that is unacceptable.

This could also be used as a cuss word for when you may be in trouble, angered at something that has happened at that immediate moment, or are in the process of being completely screwed. This is similar to the meme "FFFUUUU!"
James: Hey, I got an A+ on the test and you got a D. You fail! Haha!

Cory: You buttfuck...
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Tim: I'm being mauled by the zombies! HEELP!

Michael: I'm at the other side of the map, I can't help you!

Tim: BUUUUTFUUUUUUUCK
by Ancubius July 30, 2010
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When you stick your penis up anothers guys ass and do it until you cum. You have anal sex with him.
I had my first buttfucking experience a year ago. It was great.
by sonny vitales May 13, 2008
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A person that is stupid or can't comprehend anything, or a stubborn person.
Person 1: *plays with lighter*
Person 2: Stop
Person 1: No!
Person 2: you are a buttfuck
by honextly September 20, 2022
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when liting a cigarette off of another cigarette
buttfucking my friends cigarette was hard but it lit my cigarette
by ARF the Trooper February 16, 2008
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when two guys are having hardcore gay sex. one guy puts his cock in his lover's ass.
the hot gay couple was buttfucking all night long.
by gaybuttfucker January 9, 2004
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Scott Nelson's favorite way to make new friends.
Yeah man Scott was just buttfucking with Matt and now they're going out on friday.
by Krackalackin November 18, 2004
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