indirectly (through the use of clever words or space/time paradoxes) stopping a friend from getting laid or finishing the sex, if he does get laid.
You: Dude, you should jerk it before she comes over tonight, just in case you get laid. She'll think you last longer!
*friend, later that night after jacking off: sex lasts so long parents interrupt, meaning he couldn't finish*
Friend: Damn, he totally spockblocked me!
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.