A term used by military pilots esp. the Air Force to indicate to combat controlers, targeters, and air command that the assigned or engaged target has been hit in a manner other than superficial damage.

Also adopted by some Spec. Ops forces with similar meanings.
see above
by genmatt February 15, 2004
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This week I shacked Wednesday, Friday, and Saturday with three different guys.

I couldn't sleep last night because Amanda was shacking with her boyfriend and fucking hardcore!
by fupa December 5, 2004
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Just maybe one of the best books ever written about God. In my opinion it is right up there with the bible. Though the shack is fiction it fills in the gaps in the relationship with God.
written by William P. Young
"have you read The Shack yet?"
"no dude, i've been wanting to though!"
by Mr. Kipp September 6, 2007
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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.
by Canned Coolwhip February 12, 2011
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Air Force term, a good hit on a ground target.
by Sonic February 6, 2003
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"hey neill, wanna smoke some shack?"
by KushShady December 16, 2013
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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!
by AXO Princess January 6, 2011
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