in. to have a one-night standwith someone; to copulate [with] someone. : He only wanted to shack up with me.
in. to move in with someone temporarily, presumably for sexual purposes. : They shacked up for over a year until her parents found out and stopped sending her money.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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