A serious mental malady whereby you are convinced that you have sufficientpersuasion/hyping-capabilities to sell ice to Eskimos.
Billy Mays is said to have been so skilled at salesmanship that he could sell ice to an Eskimo, but I never found him all that appealing or convincing, so maybe he just had buypolar disorder if he actually thought that about himself.
A person who likes to bid on the things they want at the last 5 or 2 minutes, total pricks who put down a million dollars so no one would win the auction.