Cuckoo-for-cocoa-puffs Definition
adjective
(US, slang) Crazy, insane, irrational.
Wiktionary
Origin of Cuckoo-for-cocoa-puffs
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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".
From Wiktionary
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