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A person or a way of thinking (that/who) feels the need to cram absolutely anything and everything into strict man vs. woman gender binaries.

Non-binary people are faced with this in culture every day.
Binarist - "There are only two genders. Now go to the store and pick me up some 'Soap for Men.'"

Person 2 - "The ingredients are exactly the same a---"
Binarist - "Get me my Soap for Men!!!"

Person 2 - "Alright then buddy."
Binarist - "If you're quick about it I'll find some girly shit for you to watch on Netflix when you get back."
by Yackitol May 30, 2018
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