A ridiculous or nonsensical idea or story.

Something absurd or illogical.

कुछ बेतुका या तर्कहीन।

English Usage: His excuses for being late were a cockamamy mix of lies and half-truths.

Hindi Usage: देर से आने के लिए उसके बहाने झूठ और आधे सच का बेतुकापन मिश्रण थे।