(also cock·ama·my ) / ˈkɒkəmeɪmi; NAmE ˈkɑːk-/ adjective
( NAmE , informal ) ( of an idea, a story, etc. ) silly; not to be believed
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WORD ORIGIN
1940s (originally denoting a design left by a transfer): probably an alteration of decalcomania , the process of transferring a design from paper to porcelain or glass.