Meaning
'Give me a break' — a plea for leniency, a chance, or a let-off. 'Bly' is a break or reprieve (from the domino/game sense of a free pass), so 'gi mi a bly' asks someone to ease up, forgive a slip, or give an opportunity.
Examples
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Officer, gi mi a bly dis time.
Officer, give me a break this time.
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Mi will pay yuh Friday, gi mi a bly.
I'll pay you Friday — give me a break.
Origin
'gi' (give) + 'a bly' (a break/reprieve). See [[bly]], [[lowe-it]].
How it’s used
A plea for leniency, a chance, or forgiveness.