John Sullivan, the creator of the long-running sitcom Only Fools and Horses, has died. The series had some great lines, and some of the characters' catchphrases have become classics, eg 'what a plonker'.
The phrase 'lovely jubbly' (meaning "great, fantastic") was coined by Sullivan as one of Del Boy's favourite sayings. It is now in the OED, which says that it derived from a 1950s advertising slogan for a soft drink called Jubbly (that slogan was actually 'lubbly jubbly').
Such is the power of the phrase that it has spawned new senses of the word. The original sense was a response to success or anticipated success, and on Only Fools and Horses Del Boy frequently rubbed his hands together in delight, or anticipated delight, as he uttered it. The OED says of this sense:
The phrase is freq. used to suggest typically English (esp. London) attitudes and behaviour, or questionable business dealings like those of the South Londoner, Del Boy Trotter.
Soon after 'lovely jubbly' started appearing regularly in episodes, it gained another meaning, namely 'money': the Bloomsbury Dictionary of Slang has the phrase 'lots of lovely jubbly'. Having started as an interjection, it then became an adjective.
Lovely jubbly has various spellings, some of which aim to reproduce the South (Sarf) London accent, eg laaverly jubberly.
Here's a BBC article about some of Sullivan's other well-known catchphrases, both from Only Fools and Horses and also from Citizen Smith, which he also wrote.