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Fourteen consecutive days of casual relations with a man/woman where upon on the fifteenth sunrise, both participants high five and part ways.
Joe- "I got laid fourteen nights in a row."
Jake- "Dude, a fortnight stand."

Taylor- "I'm only looking for a fortnight stand."
by Allen395 November 06, 2010
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A take-off on a "one night stand." A casual sex-based fling lasting a short period of time, usually around a couple weeks.
Steve-"What ever happened to that Jersey girl you were talking to?"

Sean-"Oh, that was over quick, it was just a fort night stand."
by sourdieselkid January 05, 2011
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