Top Definition
Moom is a word describing a person, object, or animal, that has the appearance of being retarded. It can also be used as a derogatory insult. This was derived from the original Moomin Natalie.

There is also the Moom game, in which each player tries to point out the biggest moom whilst walking along a street.

Moomchild is the expression given to a young moom.
"Your such a moom."

"EUGH! Look, it's a real fuckin' moom!"

"For god sake, Moom is coming tonight as well.
by MoomCat January 02, 2008

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Stands for "Men's Opposite of Menstruation Syndrome"
A monthly cycle that men go through resulting in moodiness. The emotional male version of a period or PMSing without the physical aspects.
Watch out, Jim is on his MOOMS
by Bugmenot123123123 November 07, 2007

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to be slightly saddened when you hear or experience something that you do not like or that has otherwise make you feel unhappy in some way.
georgina: "how am i smelling today"

peter: "not so fresh"

georgina: "ow moom"
by Mezzaj January 24, 2012

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To kill someone in an unforgiving way in Call of Duty.
Dude, I just moomed you!

Get Moomed!
by Moomer September 07, 2011

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1) 'Everything', It is used to confuse others. (n)

2) A rubber blue cow, which was beheaded. (n)
1) "What is Moom!" -- "It is everything *walks away*"

2) Moom has no head.
by ben February 08, 2004

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Verb- describes the act of eating an uncooked egg off your own breast.
"Billie is such a tramp. I went to a party at her house the other week and she ended up sat there mooming with loads of guys jerking off around her"
by calicojack May 20, 2009

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A mom that is a lot like a cow.
Hey Look colin, theres your Moom!
by SirSags April 17, 2003

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