Pomogender: A gender where one denies to identify with one specific gender, or does not fit any labels for any particular gender. For example, someone who knows they're not cis, but is not interested, or can't specify what their gender(s) are. Or, someone who may fit into one gender category, but they dislike the idea of having to have a specific label.
Short for “postmodern”, a way for a person to say that they believe the current vocabulary is not quite complex enough (or diverse enough) to accurately describe their own sense of gender identity.