Etymology
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cockamamie (adj.)

"mixed-up, ridiculous, implausible," 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). There is a 1945 recorded use of the word apparently meaning a kind of temporary tattoo used by children.

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Definitions of cockamamie

cockamamie (adj.)
informal term for ridiculous and implausible;
he gave me a cockamamie reason for not going
Synonyms: cockamamy
From wordnet.princeton.edu