The definition of a platonic-overnight stay is not the meaning of this word. Shacking means that an unmarried couple is in a sexual relationship and they live together
See also playing house.
Me: Mom, where's Joseph? Haven't seen him in awhile.
Mom: Oh, he's shacking with his girlfriend.
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1. Marijuana
"hey neill, wanna smoke some shack?"
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When a slampiece spends the night with her frat-daddy in his cold-air. Usually does the walk of shame home in at least one article of his clothing.
Girl 1: Hey where were you last night? I didn't see you in your bed.
Girl 2: I was shacking with my frat-daddy!
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(Verb) To more or less bring someone home from the bar.
I shacked up with her sister last night.
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