A woman, or sometimes man, who has a square upper body, therefore little or no waist and hips and a permanently bloated stomach. They can have big or small boobs and be fat or thin. Then she has long, thin legs. So she's shaped like a goblet. If it's a man he will simply have a protruding belly and thin legs. It is one of the twelve shapes of Trinny and Sussanah, and it's a fairly common one. It's a fairly unattractive body shape.
Olivia is such an ugly goblet.