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2.
To hunker down; to base yourself out of a location; a place of respite.
"We're going to shack-up at Joe's for the weekend since we don't want to pay for a hotel room." OR "I'm shacked-up at home, but I'll meet you there."
by fozbend August 28, 2006
 
1.
1. To move in to shared acommodation with someone, generally of the opposite sex for purposes of sexual intercourse.
I'm shacked up with a few sheilas.
by sasquatchian May 30, 2005