cockamamie
From Longman Dictionary of Contemporary Englishcockamamiecock‧a‧ma‧mie /ˌkɒkəˈmeɪmi◂ $ ˌkɑːk-/ adjective American English informal BELIEVEa cockamamie story or excuse is not believable or does not make sense That’s a cockamamie idea.Examples from the Corpuscockamamie• Unemployment is not going to be solved by some cockamamie economic theory.Origin cockamamie (1900-2000) Probably from decalcomania