Meaning
Given to constant begging — always asking others for things instead of providing for oneself. It describes a moocher, forever with a hand out, cadging money, food, or favours, and by extension anyone cheaply grasping after what others have. The doubling drives home the persistence of the fault, and it is a real reproach in a culture that respects self-reliance and generosity both: the 'beggy-beggy' person shames themselves by their endless asking and their unwillingness to stand on their own.
Examples
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Nuh be so beggy-beggy, work fi yuh own.
Don't be such a moocher, work for your own.
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Di beggy-beggy bwoy always a ask fi money.
The scrounging boy is always asking for money.
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Mi cyaa deal wid beggy-beggy people.
I can't deal with people who always beg.
Origin
A reduplication of 'beg', doubled to stress the constant, habitual begging.
How it’s used
Always disapproving. The doubling marks it as a persistent trait, not a one-time request.