Meaning
To swerve, weave, or zigzag — especially to ride a bicycle or motorbike in a showy, weaving line, cutting from side to side. A rider 'dally' through the traffic or 'dally out' to show off his skill and style, and the dally is the swerving move itself, celebrated in dancehall and street-bike culture. By extension it can describe any weaving, dodging path taken through a crowd or a tight space.
Examples
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Him a dally di bike all bout di road.
He's weaving the bike all over the road.
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Watch how him dally through di traffic.
Watch how he weaves through the traffic.
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Di rider dally out fi show off.
The rider swerved out to show off.
Origin
Of uncertain origin; to swerve/weave, esp. on a bike. See [[ride-out]], [[buss-a-blank]].
How it’s used
To swerve/weave/zigzag, esp. riding a bike showily. See [[ride-out]], [[buss-a-blank]].