Indicating a particulariy fine day for weather. The sky being a single bright blue, punctuated with the occasional cloud, as in the hit cartoon; The Simpsons.
A phrase taken from an episode title of the tv show South Park. Used to tell someone that an idea, phrase or word they think is original or they created has actually already been created/done/said.
A cumulus cloud, the type you see at the beginning of The Simpsons TV show. See also Simpsons' sky. Very useful when describing to someone clouds without having to remember which ones are cumulus, cirrus, etc.