Definition of butterface in US English:

butterface

noun

derogatory, informal
  • 1A woman regarded as having a desirable body but an unattractive face.

    1. 1.1 An unattractive face.

Origin

Early 21st century: alteration of the phrase but her face.

Pronunciation

butterface

/ˈbədərˌfeɪs//ˈbədərˌfās/