Top Definition
When two people engage in sexual intercourse for longer than 1 hour. Either person may orgasim as often as they can, however the sexact must be continuos and non stop. The penis may slip out and ride the clit momentarily or you may change positions. But you cannot leave to get a drink of water or anything of that nature. Marathon-fucking may cause Friction Burn.
"Tracy wanted me to fuck her real quick before she took a shower but I wanted to take about a two hour marathon fuck".
by Benji Koontz May 16, 2006

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