1. Coo (Verb) - A complete state of relaxation and tranquility often aided by the use of marijuana.

2. Coo(ing)(Verb) - to be in the state of "coo"

3. Coo(ed) (Verb) - When coo is broken by inconsiderate fucks, due to the lack of understanding and appreciation by "non-cooers"
1. "Rahh lecture was long, man needs to coo."

2. "Man cant stop cooing, Jah bless"

3. "I'm all cooed out" (physically impossible)
by JakeKitch January 27, 2011
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p1: OMFG I JUST FOUND A 50 DOLLAR BILL ON THE GROUND.

p2: Coo'.
by nukamichianpaux May 12, 2010
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and adjective for a loud short asian girl that screams for no reason when theres drama. and calls other people names just for the fun of it when its not true. mostly considered to freshmans and always denies it when they're called it.
Emily Tran is such a coo coo girl
by jankykid June 16, 2009
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OMG you're so coo..
by CuunCuunLips January 10, 2022
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Coo is another shortened way of saying killer cool. Cartman of south park also uses it.
This site is coo, real coo
by don February 11, 2004
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less developed stage or manner of babbling, tweets; murmuring meaningless mating calls (mostly as voice mails).
Cooing at babies is vital to British speech development, but often lethal to American speech development.
by 👹 murmur raider October 23, 2018
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The sound that some of the biggest "smaller" birds make, better known as pigeons. Usually hanging around parks and within downtown areas of large cities, these pigeons make a characteristic "cooing" sound.
Me: Look over there! Pigeons!
Pigeon: Cooo.....Coo....
by Mike Rotch March 25, 2005
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