On cloud nine

To be in a state of extreme happiness, bliss, or euphoria, often disconnected from mundane concerns due to overwhelming joy or satisfaction.

The exact origin is murky, but it likely ties to 20th-century meteorology and American slang. The U. S. Weather Bureau in the 1950s classified clouds numerically, with 'nine' representing cumulonimbus-the tallest, most majestic clouds, soaring up to 60,000 feet. Being 'on cloud nine' thus implied the ultimate height of experience. Popularized by 1950s radio shows like 'Johnny Dollar,' which used it for ecstasy, it may also echo older phrases like 'seventh heaven' from religious traditions, adapted to a modern, secular twist with a scientific veneer.