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cockamamie

or cock·a·ma·my

[kok-uh-mey-mee]
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adjective Slang.
  1. ridiculous, pointless, or nonsensical: full of wild schemes and cockamamie ideas.

Origin of cockamamie

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.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for cockamamie

cockamamie

adjective
  1. slang, mainly US ridiculous or nonsensicala cockamamie story

Word Origin

C20: in an earlier sense: a paper transfer, prob. a variant of decalcomania
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for cockamamie

adj.

American English slang word attested by 1946, popularized c.1960, but said to be New York City children's slang from mid-1920s; perhaps an alteration of decalcomania (see decal).

Online Etymology Dictionary, © 2010 Douglas Harper