Top Definition
1. adjective. Used to describe a woman who has consumed herself with motherhood. Lounges in pajamas knows all the preschool shows. Talks frequently and at length about her child.

2. Noun. When your mom has had enough. Constantly says no, screaming and yelling like she has lost her mind. To a degree she has.
Dude, Mommy Monster grounded me for a month, I gotta find a way to make up not taking the trash to the curb for a month.

My friend Emily used to be awesome, now she is a total Mommy Monster.
by FreeT June 05, 2011

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