Describes an activity that although it takes up a great deal of time to complete, it's an enjoyable experience nonetheless, like oral sex when the girl is not in a hurry to finish.
When my old girl started to give me head, I was on a slowboat to china.
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.