Meaning
To burst, break open, or make a sudden explosive movement — the Jamaican form of 'burst', with wide reach. It covers a balloon or a boil that 'buss', a gun that is 'buss', and a bottle that bursts open; stretched further, to 'buss' is to achieve sudden success or fame ('him buss inna di music'), and to 'buss a move' or 'buss a blank' is to let something off sharply. From a physical bursting to a breakthrough, it names the sudden, forceful release.
Examples
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Di bag buss an everyting drop out.
The bag burst and everything fell out.
Literal sense of splitting or bursting open.
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Since im tune buss, im deh pan radio evryweh.
Since his song blew up, he's on the radio everywhere.
Figurative sense of a sudden breakthrough or fame.
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Buss a laugh wid mi nuh.
Have a good laugh with me.
'Buss a laugh' is a fixed collocation meaning to laugh heartily.
Origin
From English 'burst', with the final consonant cluster simplified as is common in Patois phonology.
How it’s used
Extremely common everyday word with many collocations: 'buss it', 'buss a blank' (fire a gun/shout), 'buss shot'. The 'become famous' sense is heavily used in dancehall contexts.