Meaning
A grown, mature woman — an adult, responsible for herself, past the age of a girl. 'She a big woman now' marks that someone has come of age. It can also be a rebuke: telling a grown woman to act her age ('yuh a big woman, behave yuhself'), or, said of a young girl acting too grown, a warning she is 'playing big woman' before her time.
Examples
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She a big woman now, she can mek har own choice.
She's a grown woman now; she can make her own choices.
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Yuh a big woman, stop di childish behaviour.
You're a grown woman, stop the childish behaviour.
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Di likkle girl a play big woman.
The little girl is acting too grown-up.
Origin
From 'big' (grown) + 'woman/ooman'; a mature adult woman. See [[ooman]], [[big-people]].
How it’s used
A grown, mature woman; also a rebuke to act one's age. See [[ooman]], [[big-people]].