A large group of men (or hermaphrodites, women with strapons, etc.) anally penetrating each other, each bending slightly in one direction, resulting in a full loop.
This can be done either horizontally or vertically, however while vertically is more difficult to pull off, it is also far more hardcore.
Aw, man, did you see that circle of love last night? they somehow did a figure-8.
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.