fuckathon

plural fuckathons

1. slangvulgarA prolonged period of sexual intercourse.

   "Now, you can lie all you want, but you can't deny all those fuckathons made us a baby, sugar. A baby you didn't want."

   1996, JoAnn Ross, Southern Comforts, page 303

   2 more examples

   College was sort of fun. I had a friend named Sue who had a Fuckathon with her boyfriend. Q. A Fuckathon? A. They fucked each other until one of them gave out. Sue gave out first, I think.

   1973, Tamsin Fitzgerald, Tamsin, Doubleday, page 122

   Three days a month became a nonstop fuckathon. He'd had these visions of himself as an oil derrick made of flesh, pumping endlessly and joylessly away.

   2009, Marcus Sakey, Good People