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2.
a saying used to call somebody an extreme version of crazy
She ran a mile on a whim. Her friends said "She is Cuckoo Bananas."
by Knuttelman May 01, 2009
 
1.
its a catch phrase manny santos from degrassi TNG uses alot
it means crazy in a cool, girlish, fun way
hello cuckoo bananas, im gonna go cuckoo bananas
by DR. JT YORKE January 07, 2010
 
3.
cuckoo bananas is an expression usually said when something goes wrong or you make a certain mistake. Or simply just say the word because its fun saying it :P
"omg thats SO cuckoo bananas!"
or simply
"Holy crap im gonna go cuckoo bananas!"
by tHAT_d0rK101 November 06, 2007