cuckoo for cocoa puffs

Adjective: Someone who will happily talk about nonsense that only matters to them which ultimately confuses or bores the listener.

Person 1: Did you hear Kayleigh going on at the meeting about her Uber Eats orders this week?

Person 2: She’s cuckoo for cocoa puffs, just like that crazy bird was for Cocoa Puffs cereal.

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