What happens after your Mom counts to three.
Mom: 1, 2, 3
Child: Oh no, she's becoming a Momster
by Yermy Battled Warter December 9, 2016
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A word used in conversation of siblings to complain about their mother. Comes from "mom" + "monster" = momster.
The momster is really angry tonight...
by Kitten123 July 11, 2005
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"A puppy for Christmas?! Thanks Momster, it's just what I always wanted!"
by LaurenLEE December 17, 2008
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An active member of the mommy mafia. (A mobster in the mommy mafia.)
"She's a new member of the West Oak Mommy Mafia - a momster in training."
by Regan and Lisa Brunsvold December 28, 2007
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a woman who kills her own child
Casey Anthony is a momster.
by BrookeNM July 4, 2011
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A momster is something your mother can turn into when she flips her shit and freaks out at you. This normally happens when:

1) you cut your own hair
2) you pierce yourself
3) when you break something

4) when you accidently say something in front of her that is more of a "friend remark"
or 5) when you accidently drop your guinea pig that she really loves to feed.
teenager: "hey mom nice new computer charger" *poke* *crash* D= "umm....te-he-he-he..." *runs in room...followed by a mom...*

Momster: "YOU %^&* TEENAGER touchin' on my effing charger!!!!! AHHHerrrrrrrHAhbdsfjdkjf..."

teenager: "0_o holy shit, my mom just turned into a momster and flipped her shit.. "
by Magentaa0_o September 12, 2011
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A mom who is extremely scary, or scary looking.
Boy: Dude, that hag is a total momster!
by Notorious VIC January 25, 2010
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