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a word used when someone says something stupid.
Allison: omgg, the sky is soo bluee!

Quin: agoo.
by deedvo. May 10, 2010
A word used by a babog baby frog when talking to its mumog mother frog

It generally means they are happy.
M - How are you darling?
B - Agoo!!
by babog24/7 April 08, 2009