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The tendency of some women, mostly those who label themselves as feminists, to mistakenly believe that they automatically know more about any given topic than a man does and who, consequently, proceeds to explain to him, correctly or not, how he feels, thinks, and things that he already knows.
Man A: When she started to femsplain to me what it really meant to be a man in the 21st century, I got up and left.

Man B: I would have done the same. There's nothing worse than a man-hating know-it-all
by TheRobster January 18, 2017
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Femsplaining is when a female or male feminist tells people how they're supposed to think about sex and gender.
"Men who won't shut up and listen are typical members of the patriarchy," Chris femsplained.
by Driveby Shooter April 14, 2013
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