In everyday spoken Chinese, a 狐狸精 húlijīng / hu.lijing (note: in standard Mandarin, the 2nd syllable is neutral tone) is a very attractive woman who uses her body and feminine wiles to reach her goal (usually sex or an opportunity to drain a rich man's bank account). She is totally unscrupulous in her drive to seduce lonely men or other women's husbands/boyfriends.

This is a term of abuse which concedes a certain degree of grudging admiration ("I wish I had her looks and willingness to disregard other people's disapproval").