Originally meaning masturbation, though more recently used to describe any sort of activity, scandalous or not.
I caught my little brother smacking toboggan!
"What up mang?"
"Not much broseph, just smacking toboggan."
The band Senses Fail released their Let It Enfold You album with a bonus disc which included a short history and compilation of their early years, "smacking toboggan" is referenced there.
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.