This word can be used in two contexts.

The first and more common is an annoying, irritable, or unintelligent person.

The second is someone who actually engages in butt sex. This usage seems fairly uncommon these days, as the word has long lost its original meaning.
Matt, shut up you buttfucker.

Maybe I would hang out with you if you didn't act like such a buttfucker all the time.
by ChemicalGoat May 22, 2009
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One who fucks....butts...of course
You would stick your dick in another guys ass and not even have the courtesy to give a reach around! (IE you're a buttfucker)
by Tawnos March 11, 2003
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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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1 to have anal sex
2 to be in trouble
1 i buttfucked her/him so hard last night
2 oh great, we're so buttfucked
by the ultimate bitch slap November 1, 2017
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When the people at gamestop buy your 50$ game for 9$, then they put it right back on the shelf for 49.99$.
Clerk: Hi welcome to gamestop, can I interest you in a buttfucking.
Customer: No thanks, I'll just sell my shit on ebay.
by Gamer69 August 30, 2012
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What happens to you when you use AOL.
I signed up for 300 free hours with AOL, and then preceeded to bend over and spread my cheeks...
by Hiro August 29, 2003
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