A man or woman's body type where they have big hips and thighs, and a large, dumpy ass, like an animal mascot for a sports team. Sometimes their head can appear too small for their body, given their huge bottom section.
I'm sure you've seen people like this. They look like a person in a Yogi Bear suit, or a team mascot, because the bottom half of their body is too big, compared to their head.
"That woman in the Accounting Department has a Mascot Body."