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also cock·a·ma·my  (kŏk′ə-mā′mē)
adj. Slang
1. Trifling; nearly valueless.
2. Ludicrous; nonsensical: gave me a cockamamie reason for not going.

[Probably alteration of decalcomania.]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.cockamamy - ludicrous, foolish; "gave me a cockamamie reason for not going"; "wore a goofy hat"; "a silly idea"; "some wacky plan for selling more books"
colloquialism - a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech
foolish - devoid of good sense or judgment; "foolish remarks"; "a foolish decision"
References in periodicals archive ?
He walked into my office with his cockamamy scheme!
He certainly didn't take well to being interrupted mid-flow and having his cockamamy US-influenced, real estate-revolutionising ideas picked apart by Theo Paphitis.
Reb Tevye, as they started to refer to him, came up with other equally cockamamy ideas until finally they had to let him go.
Though this being a Milligan comic, it's only the prelude to much cockamamy craziness.
"Hundreds of millions of pounds worth of drugs and this hugely sophisticated criminal, the Crown say, comes to Jersey and he becomes involved in what you may think is one of the most cockamamy conspiracies you have ever come across.