A secret dwelling (house or apartment etc) that nobody in particular lives in but the rent/bills are shared by a group. The purpose is a safe place to take someone for sex outside of a relationship. Rent, utilities is split up but no one person actually lives there, its only for discrete hook ups.
I have a new side chick, I need to use the bun shack for a few hours this Friday.
A mysterious room inside Lagan College, Belfast which location is only known to a few. To reveal Its secrets you would have to know a very complicated and acient password.
Irrelevant Andy: Yo mateee Wheres the Shack
Anyone: Fuck up Andy stupid twat
Sort of like saying something is 'the shizz', etc. etc.
Recycling is the shack.
When someone goes out to clubs/bars without a planned place to sleep at night. The goal is to find someone to hook up with to "shack up" with for the night. If you can't find someone, you end up sleeping outside and "shivering".
Part of the challenge is the decrease in standards as the night goes on, in desperation of a place to sleep.
Joe did "Shack or Shiver" in the city and ended up sleeping on the bench outside.
A beat up spot, ghetto place, or made of cheap materials, busted, pieced together
This bitch livin in a shim shack, the spot was falling apart, roaches an shit