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.
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
Caddy shacked is a style of motivation that incorporates coersion or convincing through avoiding conversations because there is alternative covert purposes in play..
That chick at the beach was acting so caddy shacked that I wonder if I could ever trust a girl like that..