Meaning
A sound-system deejay or selector — and, especially, a rival one in a 'sound clash', where competing crews battle with exclusive tunes ('dubplates') for the crowd's favour. In the heat of a clash the opposing sound is scornfully cast as the 'sound bwoy' to be defeated, and to 'kill the sound bwoy' or 'bury the sound bwoy' is to beat a rival sound so badly it is humiliated. So the term runs from a plain sound-system man to the taunt hurled at the enemy sound, and it belongs to the whole fierce, boastful culture of the clash.
Examples
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Di selecta drop a dubplate fi buss di sound bwoy.
The selector dropped a dubplate to defeat the rival sound boy.
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Plenty tune deal wid killing di sound bwoy inna clash.
Plenty of tunes are about beating the rival sound in a clash.
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Di sound bwoy dem lock di dance till mawnin.
The sound-system deejays kept the dance going until morning.
Origin
From 'sound' (sound system) plus 'bwoy' (boy); central to sound-clash culture, where 'sound boy' names both operator and rival to be beaten.
How it’s used
Rooted in sound-system and clash culture. Often the target in boasting/'sound bwoy killing' lyrics.