The response one gives when replying to a casual "I'm sorry." If the "sorry" is serious, then this word should not be used. It is only meant for casual "sorry's."
While talking on the phone:
"Hey dude, sorry the call got dropped"
"Rosk"
A Shackteau is a humble, weather-beaten, structurally questionable shelter located in a spectacular or highly coveted place—Wales, Jackson Hole, Sun Valley, Crested Butte, coastal Maine, the Alps—where the building itself may be worth almost nothing, but the dirt, view, access, and mythology make it absurdly valuable.
In use:
Shackteâu - We thought it was an abandoned shed until the realtor called it a rare alpine Shackteâu with unobstructed views and listed it for $2 million.