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.
by Jolie St. Laurent April 9, 2006
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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.
by SweetPeaches404 January 26, 2009
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n. A day in which all you do is eat. Usually a planned feast after a night of drinking. Closely related, or done in conjunction with Playing Hospice. Too many calories consumed througout the day make you fee like a big fat fuck.
Oh man! I can't wait for the big fat fuck-a-thon we are going to have all day on Sunday! After a weekend of binge drinking, there will be nothing better than eating everything in sight. Perhaps we can have our big fat fuck-a-thon while we are playing hospice!
by Big Fat Fuck May 6, 2009
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