Combination of Man and Explaining.
When a man explains to a woman in full detail something that is very easy to understand of that the woman knows about. It commonly is heard whenever a feminist is around and she doesn't like the way shes being talked to.
Man - You see, the way you work out the hypotenuse is by adding A squared and B squared, then you squareroot the answer
Woman - I have a degree in mathematics, I know how Pythagoras Theory works, stop mansplaining everything
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