GenderqueerA genderqueer is part of a group of people who reject heteronormativity, the traditional two-gender system.
There are different modes of being genderqueer, and it is an evolving concept. Some believe they are a little of both or feel they have no gender at all. Others believe that gender is a social construct, and choose not to adhere to that construct. Some genderqueers do fit into the stereotypical gender roles expected of their sex, but still reject gender as a social construct. Still other people identify as genderqueer since, though they are cisgendered, they do not fit many of society's expectations for the gender in which they identify.
This term can (but does not necessarily) include any transgender person. These individuals challenge the social norms of gender definition, in much the same way as homosexual and bisexual individuals challenge the social norms of sexuality.
Some genderqueers prefer that one use gender-neutral pronouns to refer to them, such as "sie" and "hir or singular "they instead of her/his, and some prefer the use only of their name and no pronouns at all.