[hypocritter]

Bakku-shan: Japanese for a woman who "seems pretty when seen from behind but not from the front."

What about the reverse? Frontu-shan: "seems pretty when seen from front but not from the back" :)

[twippo]

Probably "Furontu-shan", as Japanese syllables end in vowels or "n", so consonant sounds are usually broken up with vowels.

[Erasmus]

And then there's bakku-tran.

That's where you see a really sexy longhaired chick from behind and then you discover it's a guy.