An ex-girlfriend or boyfriend who will knot get lost. Play on words: not/knot. Connotes other meanings of "will knot," lending a derogatory air to the disposed of individual, comparing them to something gross stuck between your ass cheeks.
He broke up with her, but she still WILL NOT stop texting him. She's a WILL KNOT and needs to get a life, like, now.
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.