0peny0ureyes's definitions
A butt with a shape similar to that of a Goomba, the brown, mushroom-like enemy from the Super Mario video game franchise. Like a trapezoid with rounded corners, the butt is wider at the bottom than the top and horizontally flat across the lower edge. In form fitting pants, rather than looking like a pair of melons, the goombutt looks more like an underfilled water balloon sitting on a table.
I thought she looked good, but then she turned around and saw that she's got a goombutt. That chick needs to get her ass to the gym.
by 0peny0ureyes June 7, 2019
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