A bigender person will change their gender presentation based on the situation. At some times they will present as male and sometimes as female. Bigender is a lesser known word including cross dressers and drag queens and kings. Some people bigender should only refer to people whose gender presentations both match their gender identity; this makes the term more complicated, excluding some drag queens and kings who are fully men and are motivated by fun, fetishism, or politics rather than identity.
Trans & Gender 101 >