Cuckoo-for-cocoa-puffs Definition

(US, slang) Crazy, insane, irrational.

Origin of Cuckoo-for-cocoa-puffs

  • 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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