Sharkfucking is basically a stronger version of the adjective 'motherfucking'. As a result, it means just about everything, and can be added to a sentence as a sign of respect, awe, terror, disgust, hatred or truly any strong emotion.
I'm had it with these sharkfucking snakes on this sharkfucking plane!
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 $2million.