Bitch

今天到学校去准备开学，听到同事跟她的好朋友说：“Tell me why you have been such a bitch all day today." Ha ... 我笑道: "I've been trying to find a good Chinese translation for ‘bitch’."
几天前在网上看了Julie & Julia，觉得其中bitch的中文翻译得不大好，你说bitch中文是什么？