Meaning
A member or representative of a sound system — and, in the heat of a sound clash, a scornful name for the rival sound you set out to defeat. To 'kill the sound boy' or 'bury the sound bwoy' is clash talk for beating the opposing sound so badly it is humiliated, a whole genre of dubplates and lyrics built around burying the sound boy. So the term runs from a plain member of a sound to a taunt hurled at the enemy sound.
Examples
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Dis dubplate a bury di sound bwoy tonight.
This dubplate will bury the rival sound tonight.
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Sound bwoy caan test wi.
No rival sound can challenge us.
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Him a run wid a sound bwoy crew.
He runs with a sound-system crew.
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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.
Origin
From 'sound' (system) + 'boy'; a sound-system member, or a rival sound to defeat in a clash. See Sound clash, Dubplate.
How it’s used
A sound-system member; in clash talk, a scornful name for the rival sound. See Sound clash, Dubplate.