Longman Dictionary of Contemporary English homepage

Date: 1900-2000
Origin: Probably from decalcomania

cockamamie

 adjective
     
cock‧a‧ma‧mie American English informal
a cockamamie story or excuse is not believable or does not make sense:
That's a cockamamie idea.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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