Feminazi is a not little controversial term. It is a compound word (or acronym) for two terms feminism and nazi. It understands itself as a serious and derogatory insult toward those feminists radicalized. Analogically, we could say that if there are people from extreme left or other extreme right, feminazis would be feminist extremists.
* Only one "like" per meaning and day, the more "likes" the meaning will appear higher in the list