another way of saying butterface, referring to someone who is 8/9ths perfect, but the uppermost 1/9th is a killer. one can say "nnd" for short.
you see her standing on line, waiting to check out. expensive high-heel FMs, tan hose, long slender legs, perfect heart-shaped butt, gently curving hips, slim waist, large firm breasts, elegant neck. the ideal woman.........and then she turns toward you........and has a face like the dark side of the moon. oh well, they all look the same with the lights out. this is the essence of nice from the neck down.