How do you describe a young woman who, while pretty when seen from behind, is ugly when seen from the front?

Is there a term, a phrase or an idiomatic expression to describe a young woman who, while pretty when seen from behind, is ugly, if not repulsive, when seen from the front?

After some searches I focused my attention on "double-faced woman", but I'm unsure whether this is the best expression one can think of.

Solution 1:

A butterface:

Etymology 1

Contraction of "but her face" (as in: "Everything about her is great, ... but her face.").

Noun

butterface (plural butterfaces)

(slang) A woman who has an attractive body but less attractive facial features.  

Solution 2:

A slang term would be brunt. The japanese have an exact word for it bakku-shan.

Brunt meaning everything ugly in front. Butterface is a good substitute but points out that she has an ugly/chubby face which might not be the case.