putting a penis into someone's anus
serge loved buttsex a whole lot, especially with his guy friends
by shitwrecker May 29, 2006

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1) taking it like a man, in the behind.

2) doing wrong to someone, like backing into their new convertible and not leaving a note.
I totally buttsexed the shit outta that guy!

this fits both definitions.
by anniekin. August 10, 2007

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What some lucky few straight guys get to do with their ladies...

What some unlucky prison bitches get to do with big Bubba.

What gay dudes do all the time...
BUTT SEX ANYONE?
by Jew Reelie Wanna No March 28, 2009

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Some thing that nothing can be more hilarious than.
"excuse me, ahem, BUTT SEX!"
by KaseyDClarke May 19, 2007

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Someting Cathy craves, but only if it's *quality* buttsex.
Cathy heard about buttsex on HBO, but thought she had to get arrested before having it. We haven't seen her in four months.
by Scott'n'Ann January 24, 2004

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Sex in the butt
John put his penis in and out of Edd's butt, real hard an fast. They had buttsex.
by Clash.360 September 21, 2009

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When a man fucks another guy in the butt. He makes love to his ass and can't get enough. Homosexual or gay men do this with eachother when theyre horny. Its fun.
I love to have butt sex with my boyfriend rehmeyer when I get horny.

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