A bastard or cunt who is stingy and doesn't help you when you need it.
Jake: Hey man, can I borrow one of your condoms for my hot date tonight?
Floppy Twat: No man, I don't have enough left.
(Floppy Twat knows he isn't going to use them, but makes Jake suffer anyway)
Jake: You floppy twat.
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.