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Like mansplaining but when your mom does it.
Momsplaining is the act of explaining things to your child that they, obviously, already know.
Mom: Don't forget to lock the door when you leave. And to lock it you have to turn it to the left not the right.

You: You don't have to momsplain. I've lived in this house my whole life.
by ThisThatGuy December 29, 2012