Thanks for asking.

Well first of all, words are made up. Then through common usage they find their way into dictionaries. That's simply how it works because living languages evolve over time, which is useful and appropriate. Secondly that word is not exclusively used by "feminists" and even if it was, so what. Not everyone agrees with Mr Jezzaaah's dim view of feminists, who have historically achieved great things to further the cause of women. Thirdly, as to the definition, it's a term used to describe the tendency of some men to explain things to women in a patronizing or condescending tone because they assume women are too stupid to understand. This happens all the time, so why shouldn't there be a word for it. Lastly, I'm not making any assumptions about you, and thanks again for asking me to clarify.

EDIT: words