To mansplain is to interrupt a female's speech in a condescending fashion, only to interject sexist, redundant, or belittling remarks into a conversation with no actual benefit to either person in said conversation.
"So there I was, discussing with the mechanic the issues I had been having with my transmission, when my boyfriend jumps in and starts mansplaining to us about how combustion engines work. He wasted a good 15 minutes of her time....."
by SaffronTangerine September 13, 2017

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
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
by shhhhhhhlj January 28, 2018

When a man explains something to a woman in a patronizing tone as if the woman is too emotional and illogical to understand.
"She got all pissed at me for no reason!" cried Ira, "Accusing me of mansplaining."
Aziz shook his head. "Women! Right?"
Aziz shook his head. "Women! Right?"
by Babydoll75 March 6, 2019

When unsolicited advice or direction is given to a woman by a man in a condescending manner. The reasons typically being, the man does not believe the woman is capable of completing the task independently and must need guidance.
"You're not doing that how I would do it so I'm going to bother you with my directions and opinions even though I am in no way a superior and you did not ask for clarification. There is no way you are capable of doing this by yourself and must be ignorant so you have to rely on my constant guidance."
"uh, I think I got it.. thanks."
Mansplaining
"uh, I think I got it.. thanks."
Mansplaining
by tybkylie December 14, 2018

A blend of man and explain. When a person explains something to another about a subject on which the latter is more knowledgeable. Usually the word describes a conversation in which, due to sexist bias, a man automatically assumes he is more knowledgeable than the woman he is talking to.
Man: "Let me explain you something-"
Woman: "Dude. I have a PhD in this subject. I'm pretty sure I know more about it than you do."
Man: "Yeah,you have a PhD, but hear me out-"
Woman: "Do you realise you are mansplaining right now?"
Woman: "Dude. I have a PhD in this subject. I'm pretty sure I know more about it than you do."
Man: "Yeah,you have a PhD, but hear me out-"
Woman: "Do you realise you are mansplaining right now?"
by theTransMusician July 4, 2018

A word used by feminists to silence men and prevent them from learning that men actually have problems too and that their point of view isn't the only one
Feminist "women are paid 77 cents for every mans dollar"
A man "well actually every serious study showed that there more factors than just gender like how long they worked there and education"
Feminist "Stop mansplaining you patriarchal fuckface"
A man "well actually every serious study showed that there more factors than just gender like how long they worked there and education"
Feminist "Stop mansplaining you patriarchal fuckface"
by Chumley69 December 29, 2015

When a man speaks to a woman exactly the same way he speaks to a man: somewhat mockingly, somewhat condescendingly, somewhat confrontationally. Ironically, feminists who champion equality among the sexes, expect men to change how they speak to accommodate their feminine sensibilities.
Woman: I don't feel conservatives care enough about social justice.
Man: That's ridiculous! That's just SJW propaganda. There can never be social justice if individual justice is ignored.
Woman: Stop mansplaining, you big jerk!
Man: That's ridiculous! That's just SJW propaganda. There can never be social justice if individual justice is ignored.
Woman: Stop mansplaining, you big jerk!
by Ijiwaru_Sensei November 19, 2016
