Penetrative anal sexual intercourse. Usually performed by homosexual men as intercourse or by heterosexual couple, and it is performed for pleasure rather than reproductive purposes (unlike vaginal intercourse).
BETWEEN HOMOSEXUALS:
Peter: "Hello Marty, do you want to have Butt secks today?"
Marty: "Ok"

AS INTERNET DISCUSSION FORUM SLANG:
Gary: "MAZZINA95 TOTLY LKes BUTTSECKS!!!!"
Tim: "Get away you spammer"

AS CONVERSATION DURING FAMILY DINNER:
Father: "So Jen, have you decided what university you want to go to?"
Jen: "yes father, the UNIVERSITY of BUTTSECKS!! I HATE YOU, and I'm NOT going to study to become a lawyer as you want me to!!
Father: "So you want to have butt secks as your profession.. well, a lot of whores do make a lot of money, so I do not see why not"
*Jen Cries*
by Barley234 April 03, 2008

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When a Male sticks his wanky in another person (or animal's) Poopchute.
Eshold1 and -Pyroblaze- said they had some sweet love on the ign boards, pointing to buttsecks.
by BriankidGC August 31, 2003

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Online jargon that means butt sex, which in turn means gay sex.
Oh noez, butt secks hurts!
by igor pilot October 19, 2007

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Anal intercourse with socks on.
"Brooke likes butt secks with strangers."
by POTsdamSandStoners February 10, 2010

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the combination of the word butt with secks, usually used when describing homosexual ass pounding, also used to describe sodomy
Homo 1: So you horny tonight for the butt secks?
Homo 2: Of yeah, butt secks me hard!
Homo 1: Fark yeah, teh butt secks r0x0rs hard!
by teh_butt_sex_roxors! February 23, 2006

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to describe public displayes of affections, to get someone in trouble or humiliate someone in public
"They were having butt secks in Study Hall"
"STOP HAVING BUTT SECKS"
by EL AGUA October 14, 2007

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the plural of buttseck
BUTTSECKS RLY

that about sums it up right there
by Natolya Koksanov May 16, 2006

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