A term shouted once a situation between two men has become too sexually explorative.
Commonly used after a build-up of pornographical exchange and consequent discussion.
The term shack refers to the future of the relationship as becoming something of an obsession; resulting in the two involved living, one day, in a shack, watching porn, at the age of 63.

Chris: Don't you just love it when the chick turns around and does this thing where...
Tim: Oh my god I know! And then the DONKEY just goes ballistic on her tiny...
Chris: SHACK! FUCKEN SHACK!
Tim: Yeah, true that.

SHACK! by Simon Jackemof May 7, 2008

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shack shirt

a girls reward for an excellent night in bed. The shirt is one of the lucky male's T-shirts that serves as a trophy or badge left from the hookup

Do you think he'd give me his fav Vinyard Vines Tee for my formal shack shirt?

Kelsey: So cute! where'd you get that?

Amy: its just an old shack shirt

shack shirt by fratdaddy24601 December 10, 2013

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