A ponytail on a balding man. It can be viewed as a bad cross pollination between an ultimullet and a skullet. Very popular hairstyle in the 1980's.
Also, it is a species of endangered fish (Gila elegans). It is a rare minnow found in the Colorado River.
My bald old man has a bonytail down to his fatass.
A girl with no booty where her pants can barely stay on without the assistance of a belt.
The kind of bonytail that you don't bounching on your cock because it will be like fucking a wall