Gender bender (also known as genderf*ck) is an informal term used to refer to a person who actively transgresses, or "bends," expected gender roles and presentation. This is usually achieved by combining masculine and feminine attributes in unexpected ways.
Some gender benders identify with the gender assigned them at birth, but challenge the norms of that gender through androgynous behavior and atypical gender roles. Gender benders may self-identify as genderqueer or non-binary, feeling that the gender assigned to them at their birth is an inaccurate or incomplete description of themselves; some are transsexual and desire to change their physical sex through hormone therapy or sex reassignment surgery, while others were born intersex.
In some contexts, 'gender bender' is seen as an insult. This term should only be used for people who have stated they are comfortable with it.