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When a man explains something to a woman, uninvited, about a topic she is either equally qualified or more qualified to talk on.

A male doctor explaining something to a female patient, for example, would not be mansplaining.

Examples: The guy who tried to tell Margaret Atwood about "The Handmaid's Tale", the guy who told Katie Mack, who has a PHD in Astrophysics, to "learn some science" because he thought climate change was a hoax, the man who tried to correct a woman about how to pronounce her own name correctly, an Englishman correcting a Welsh woman on her Welsh pronunciation.

See also Dunning-Kruger effect.
Look at this idiot trying to mansplain periods to women... he thinks women only have nine periods a year... wait 'til you hear his lecture on how to insert a tampon correctly!
by Jorgs August 02, 2019
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Jul 6 Word of the Day
Phrase meaning that a deceased cannot rest in peace until society changes due to the circumstances of a death.
People said rest in power for the unarmed man had been shot by the police.
by FooBarBiz October 12, 2017
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"a man explaining (something) to someone, typically a woman, in a manner regarded as condescending or patronizing."

"Solnit told an anecdote about a man at a party who said he had heard she had written some books. She began to talk about her most recent, on Eadweard Muybridge, whereupon the man cut her off and asked if she had "heard about the very important Muybridge book that came out this year"—not considering that it might be (as, in fact, it was) Solnit's book. Solnit did not use the word mansplaining in the essay, but she described the phenomenon as "something every woman knows".

"A month later the word appeared in a comment on the social network LiveJournal. The word was included in 2010 by the New York Times as one of its words of the year, nominated in 2012 for the American Dialect Society's "most creative word of the year" honor, and added in 2014 to the online Oxford Dictionaries."
Ignoring she had a PhD in the subject discussed, the undergrad decided to mansplain the basics to her.

He didn't think of himself as a patronizing know-it-all, but he frequently interrupted his friends to mansplain.
by rabblerabblebarbar October 18, 2018
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When someone "explains" something to another person about a topic they are already familiar with/understand. This is typically done in a condescending manner under the pretense that the speaker knows more about the topic than who they are speaking to, i.e. they are subordinate.
1) Explaining the rules of poker to a poker dealer
2)Repeating a point back to someone in your own way, even if they just said the same thing
3)Telling a person that you know more about something because of blank, even though they are a professional/have a degree in the field that you do not have

Sidenote: it is okay to know a lot about a topic and make this known in conversation, but assuming that you know more than someone else, not accepting if you are wrong, not accepting that they may simply be more knowledgeable, and/or doing so in a condescending manner means that you are mansplaining.

Note: this definition and examples were built together by both a man and a woman
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Essentially when a man assumes a woman (sometimes a man) lacks knowledge in an area where she (or he) is known to be an expert
Me reading the other definitions of "mansplain": Wow, these all sound like they were written by men who have never experienced mansplaining themselves! Now, they're trying to explain what it is. CLASSIC mansplaining!!

2nd-year law student: I cannot believe Matt just mansplained me about the difference between prosecutors and defense attornies. This dude is referencing TV shows LMAO
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by sjsnowflake January 28, 2018
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A sexist slur created by feminists to invalidate someone's opinion based on their gender.
Man: I don't think adding my gender as a negative prefix to a word would do much to achieve gender equality

by LLovett December 22, 2016
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Quite regularly, during team meetings in front of every else, when a woman who is reporting on her own project work with which she is most experienced with and has worked in the field for over twenty years, another peer always feels the need to "complete" her sentences mid-way, talks over her, hijacks her time to shine, taking over the explanations, progress report, issue deconstruction, evaluation, or review, thinking that even though they only have one fifth of the experience, knows little to nothing of her project work in detail, they must though have the knowledge to report on the woman's work better than she can.
She (as the lead scientist): To report on my findings of the project work I have been completing for the past month,

He (as the apprentice): <interrupting> the results show... bladibla…

Her peers: rolling their eyes, internally thinking (there he goes again, mansplaining...what a narcissist!)
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