A slightly shortened version of "cool"
used by only the cooest people, coo is the best way to describe something that is completely awesome.
urbandictionary.com is the cooest website i visit daily.
i have such a coo life.
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Coo is another shortened way of saying killer cool. Cartman of south park also uses it.
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cool and/or alright; okay / yes; in agreeance with.
coo man, coo.
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someone who is so cool and smooth that they don't even finish the normal syntax in lieu of a quicker, sleeker version of 'cool' <i.e. above the norm, rebel-like>
"Man have you seen Boo Sky? They are coo peeps"
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