Leaving a large group of people with your significant other, saying you are going to "warm up the car" but are really engaging in some sort of sexual activity with them. Much less suspicious when said in the winter, but is extremely fishy in the summer.
Boy whispers to girlfriend: "Hey baby do you wanna go warm up the car?"
Girlfriend whispers back: "I thought you'd never ask."
"Hey we'll be back in a few minutes, it's cold outside so we're gonna warm up the car."
A couple leaves to 'warm up the car', and one person says to the rest of the group: "Wait, why are they warming up the car? It's the middle of summer!"
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.