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
Get the mug
Get a Moom mug for your grandma Nathalie.
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
Get the mug
Get a MOOMS mug for your brother-in-law Callisto.
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
Get the mug
Get a moom mug for your grandma Nathalie.
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
Get the mug
Get a moom mug for your mama Zora.
To kill someone in an unforgiving way in Call of Duty.
Dude, I just moomed you!

Get Moomed!
by Moomer September 07, 2011
Get the mug
Get a Moom mug for your barber Larisa.