Meaning
To let go and dance freely and wildly, holding nothing back — and, more broadly, to break loose or misbehave. On the dancefloor, to 'bruk out' is to abandon all restraint and give yourself fully to the music and the moment, and a good tune makes the crowd bruk out. Beyond the dance, it can mean to run wild, break free of control, or cut loose from good behaviour, and it carries the whole feeling of restraint suddenly cast off in a burst of energy.
Examples
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When di tune drop, di place bruk out.
When the song dropped, the crowd went wild.
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Bruk out yuhself an enjoy di dance.
Let loose and enjoy the party.
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Di pickney dem bruk out when teacha gone.
The children ran wild when the teacher left.
The broader 'break loose' sense.
Origin
From English 'break out', with the Patois pronunciation 'bruk'. 'Bruk' also means broke or broken in other contexts.
How it’s used
In a dance setting it is wholly positive. Elsewhere it can mean to get out of hand.