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1.
Marathon sex between two sexually athletic people. More than 12 hrs of sex-n-rest. A couple who tries to see how many postions and places they can climax in a given day, weekend, or timeframe.
Every time we've ever had sex it's always led to a fuck-a-thon. It takes me a week to recover. His rebound time is less than 10 minutes.
автор: Jolie St. Laurent 9 апреля 2006
 
2.
an event where a guy and a chick get it on repeatedly, as if they're never gonna stop
"How was your date?"
"Lasted all weekend, a real fuckathon.I was exhausted by Monday morning, glad to go to work."
автор: Jake 15 марта 2004
 
3.
1. similar to marathon just with fucking
2. can be just continous sexual contact between a man and a woman
3. 3-some, 4 some, 5 some, etc (when u get the "buds" together and they arent weraing any clothes except perhaps a tie)
hey i went to a fucka thon

man i was tired after my 36 hour fuckathon with marissa

man lets get bob, cally, merry, dolly, and mark togehter so we can all do each other up the ass
автор: BHUDDA'S FRIEND 2 июня 2005
 
4.
a long session of sex.
Chick 1: Girl, where you been all weekend? We was supposed to go to the movies.

Chick 2: My bad girl, me and my man was having a fuck-a-thon.
автор: SweetPeaches404 25 января 2009
 
5.
When people indulge in sex for longer periods of time, usually over the weekends and in groups. Gays regularly engage in fuckathons on weekend.
Mark: "Boy my ass is sore and I can's hit; it took 20 loads this weekend"
Eli: "Man, you were in a fuckathon"
Mark: "Yes, I was and it was one helluva experience."
автор: shmuzzy 27 февраля 2010