Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective US, slang Crazy, insane, irrational.
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
Catchphrase of Sonny the Cuckoo Bird, the cartoon mascot of the General Mills breakfast cereal Cocoa Puffs: "I go cuckoo for Cocoa Puffs!" Compare cuckoo meaning "crazy".
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