Meaning
Pregnant — 'she big belly' means she is expecting a baby, and to 'get big belly' is to become pregnant. In its plainer sense it also describes a large, protruding stomach or pot-belly on anyone. Context makes clear which is meant, but the pregnancy sense is the most common and the most charged, since it figures in so much talk of romance, family, and 'who breed who'. Blunt and direct, the phrase names the visible fact of the swelling belly.
Examples
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She big belly, di baby due soon.
She's pregnant, the baby is due soon.
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Di man have a big belly from too much beer.
The man has a big belly from too much beer.
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Wen she get big belly, everybody happy.
When she got pregnant, everyone was happy.
Origin
A plain compound — 'big belly' — used for both pregnancy and a large protruding stomach.
How it’s used
Chiefly 'pregnant'; also literally a pot-belly. 'Belly' alone can also mean pregnancy ('she a carry belly').