Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
cockamamy is an adjective meaning "informal term for ridiculous and implausible". It carries one recorded sense.
informal term for ridiculous and implausible
“he gave me a cockamamie reason for not going”
colloquialism
Definitions, synonyms and semantic relations for cockamamy come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.