butterface

butterface

slang A woman who has an ugly face but is otherwise appealing or attractive. The term is a play on the phrase "but her face" (as in, "everything is pretty but her face"). Yeah, she has a great body—too bad she's a butterface.
Farlex Dictionary of Idioms.

butter face

n. a very ugly woman; a woman with everything just right but her face. Nice shape, but she’s a butterface.
See also: butter, face
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • butter face
  • put (one's) face on
  • put face on
  • put on (one's) face
  • put one's face on
  • get out of (one's) face
  • get out of face
  • get out of one's face
  • get face
  • get out of someone's face