A human being born with or somehow made it so they have both a penis and a vagina. Whether or not they have bust or testactles is debatable.
Nick: :O I met Chris Crocker today.
Mitch: That person is a unig
Nick: A what?
Mitch: A person with a vagina and a penis.
Nick: Ohhh. >_< thats wierd.
Mitch: I know.