mammsplain Posted in M Best definition mammsplain Verb: (of a woman) to explain something to someone, typically a man, in a manner regarded as condescending or patronizing Mammsplaining happens 100 times more often than mansplaining. How satisfied are you with the definition? Looking for mammsplain meaning? Delighted that you discovered the greatest determine on our web site! Recently this definition was actually observed 14 times.