Top Definition
To be an authority in all things man.
He's a manthority when it comes to dating.
by Vandalman April 26, 2015
False authority or sense of authority attributed to or asserted by a man, solely by virtue of being male.
Alice: And then he said, "I'm the man of this household and I'm putting my foot down!"
Carol: He used his manthority?
Alice: Yes, then I slapped him.
by emperor penguin May 29, 2012
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