n. a social networking site for moms of teens and tweens powered by Family Circle magazine
Instead of joining facebook, I'm going to join Momster to connect with other moms like me.
by momstermanda January 7, 2010
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A guy who lives with his family but acts like he is all that.

A person who has a lot of gear but lives at his parents.
I bought the new Iphone this week.

"Dude your a Momster and you can afford it."
by Chickenhuner August 29, 2007
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“Momsters” are hip, tattooed, irreverent, sex-positive mothers who care for their children with an alternative, holistic approach to parenting, often frowned upon by modern day June Cleaver clones.
Hey man, look at that momster over there with her boob in that baby's mouth! Who do you think does her ink?
by MILF and Cookies March 17, 2014
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A nasty stepmom who always has a resting bitch. Face is unpleasant and treats, her husband and her husband’s family like garbage but her own family can do no wrong.
My step momster got her own kids something lovely for the party but only got my kid a crappy cheap trinket.
by Cat daddy 043 April 9, 2023
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The one and only Abigail Mineer. She fully embodies the title of Momster.
Abigail is such a momster. She's comes out at night.
by ABJS March 10, 2021
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Momster is when a scary and angry man does a satanic ritual and becomes what we call a momster. Momsters can be very dangerous but you will know when you meet one because they are sus as fuck.
(bob): You seem sus omg are you momster?
(momster): *eats him*
by GergeManDoc February 17, 2021
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