adjective Slang.
ridiculous, pointless, or nonsensical: full of wild schemes and cockamamie ideas.
Also, cockamamy.

probably earlier than 1940–45, Americanism; in orig. sense, paper strip with an image which could be transferred to the skin when moistened, apparently alteration of decalcomania; sense “ridiculous” probably by association with cock-and-bull story, poppycock, etc. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cockamamie (ˌkɒkəˈmeɪmɪ)
slang chiefly (US) ridiculous or nonsensical: a cockamamie story
[C20: in an earlier sense: a paper transfer, prob. a variant of decalcomania]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

Amer.Eng. slang word attested by 1946, popularized c.1960, but originally perhaps c.1920 alt. of decalcomania (see decal).
Online Etymology Dictionary, © 2010 Douglas Harper
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