Mini-wheat

A person who looks completely attractive from behind, but much to your dismay, upon seeing their face, you realize they are ugly after all.

This name originated from a small town in western Pennsylvania, when a man known only as "DPM" thought of this term. The term is an adapted metaphor for the actual cereal, because although one side is sweet and frost, they other side is bland and grainy.

"She had an amazing ass, but when she turned around, I realized she was a mini-wheat."