Although this can mean what you think it means, it can also refer to the consumption of discolored semen which occurs because of an infection. Both the discoloration and consistency of the semen form the gravy half of the phrase.
After all that kinky shit, I couldn't help but give my wife a gravy chaser.
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.