An absolute contradiction in terms, much like Communazi. Nazism, and more generally Fascism, is a distinctly masculine political system which places particular emphasis on brotherhood and male strength. Feminism is a movement which seeks equal rights and respect for all people regardless of gender. They are opposing viewpoints.
Person 1: You're such a feminazi!
Person 2: Please stop using nazi as a suffix to mean radical/overbearing/in-your-face. That's not what it fucking means.