It means you put the penis in the ass. Duh?
"Our Buttsex was good last night! Wasn't it Kaitoo?" Riely asked
by Dick Heads January 31, 2015
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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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A "savory" treat selfish women like to reserve for special occasions
by Chico Rusty February 15, 2011
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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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serge loved buttsex a whole lot, especially with his guy friends
by shitwrecker May 29, 2006
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(•_•)..
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When you open up your buttcheeks nice and wide so the other person can stick their dick inside.
We were having buttsex, then my mother came in and saw my 12 inch dick being shoved up the other guy's anus.
by DoctorRoflcopter March 13, 2015
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