Meaning
Jazz music — long woven into Jamaica's rich musical heritage. Jamaican jazz players shaped the birth of ska and reggae (many session musicians were jazz-trained), and Jamaica hosts jazz festivals to this day. As slang, to 'jazz up' something is to liven or dress it up.
Examples
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Di ole session man dem come from jazz.
The old session musicians came from jazz.
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Jazz influence run deep inna ska.
Jazz influence runs deep in ska.
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Jazz up di place wid some decoration.
Liven up the place with some decoration.
Origin
The jazz genre; deeply tied to Jamaican music history (ska and reggae grew partly from jazz-trained players). 'Jazz up' = liven up.
How it’s used
Jazz music (a root of ska/reggae); 'jazz up' = liven/dress up. Compare 'ska', 'mento', 'nice-up'.