Meaning
Very thin and scrawny, skin-and-bone — the reduplication of 'maga' (meagre, thin) doubling it for emphasis. Where 'maga' says thin, 'maga-maga' says pitifully, weakly thin, and it is used of a wasted-looking person or a poorly, half-starved animal — a 'maga-maga dog'. The doubling to intensify is a common Patois pattern, and here it stresses just how skinny the thing is.
Examples
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Di dog look maga-maga, feed it.
The dog looks skin-and-bone; feed it.
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Him come back from foreign all maga-maga.
He came back from abroad all skinny.
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Di maga-maga puss beg food.
The scrawny cat begs for food.
Origin
Reduplication of 'maga' (meagre/thin) for intensity — a common Patois pattern. See [[maga]], [[likkle-likkle]].
How it’s used
Very thin/scrawny; reduplication of 'maga' for emphasis. See [[maga]], [[likkle-likkle]].