Crazy; very eccentric; nutty: Where do you get these cuckoo ideas? (1918+)
A crazy or eccentric person (1581+)
[perhaps because of the bird's monotonous, silly-sounding call]
“coo-coo,” the image repeated, and then retired until the hour hand should summon him once more.
"coo-coo," came the plaintive note of a dove from the leafy shades close by—but it cooed unheard.
Kindly stand back two feet from the mouthpiece and say coo-coo three times, with a rising inflection on the final coo.
I think we had had Frise-tte two years, and coo-coo more than a year, when there came the clearing-out of pets that I told you of.
And the little hen canary was called "coo-coo," because when she first came to us she really did make a sort of cooing noise.
It was the cage, all covered up in a sort of brown holland bag, which contained my beloved Frise-tte and coo-coo.
They were very good friends—indeed Charley and I thought it rather horrid of coo-coo to be so quickly consoled.
I had to open my eyes then—Mamma was holding coo-coo tenderly in her hand.
I have a good deal more to tell you about coo-coo, but for the present I will leave off with this piece of advice.
coo-coo seems very little the worse—she has had a wonderful escape.