In Chinese mythology (especially Journey to the West), 妖精 are animals or plants that have cultivated spiritual power and taken human form to trick or harm people. The fox spirit (狐狸精) is the most famous type.
usage
When used to describe a woman, 妖精 can be either playfully teasing or derogatory, depending on tone. It implies someone seductive or enchanting — similar to calling someone a 'vixen' in English.
