used to describe leftover goods (or people) that no one wants that are of inferior quality; it is often used as a derogatory term to refer to women who are the “Leftover Women” and unwanted by men [colloquial]
literally: 'leftover orange'; used to describe leftover goods that no one wants that are of inferior quality; it is often used as a derogatory term to refer to women who are the "Leftover Women" and unwanted by men