Top definition
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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Jul 30 Word of the Day
A kid in my class is a water slapper
by jgyhsref January 22, 2020
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2
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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3
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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4
Lyric used by Canadian musician Kristofer Lee Scott to paint a beautiful image in his song Betting It All on his EP Who Am I To You?.
"So help me beat the oooooodds. When everybody else eems to be shacking up. I'm taking a chance..." -Kristofer Lee Scott
by TheNgster April 07, 2019
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