Top Definition
1) When a man who has no expertise in something tells a female, who is an expert how something works, is, or came to be. 2) When a man repeats what has just been said by a woman and presents it as his own idea 3) when men can't stand anything that questions their egos and thus change the meaning of terms so they don't look like idiots.

1) Can you believe that man who knows nothing about math physics, or engineering just mansplained the woman who works at NASA on how rockets work?

2) When men steal ideas and words out of the mouth of women and then proceed to present them as their own in a condescending manner that's mansplaining
3) He then proceeded to define mansplaining to her.
by Not a mainsplainer March 11, 2017

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