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Couples who live together (often while having sex) and are not married.
You him and that girl are shacking up!
by bb* July 29, 2008
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Regularly hitting the sheets with someone youare not dating OR casually moving in with someone you regularly hit the sheets with.

Living in sin.
Donna spends all her time over at Jim's house, they have been shacking up together ever since they hooked up on Fat Tuesday.
by Mona Madly July 22, 2008
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Giving someone a blowjob. Named after the band the Shackletons because they suck so much.
"yeah, i was at the shackletons concert. but i was in the bathroom shacking up because it sucked so much"
by ShackletonHater April 14, 2010
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