Meaning
The ground; the earth — and, crucially, land or a plot for farming. 'Him have a piece a grung a country' means he has some farmland in the countryside, and to 'work di grung' is to cultivate the provision ground. The Patois form of 'ground', it carries far more than the plain earth underfoot: it names the small farmer's land, the source of food and livelihood, and working the grung is central to rural Jamaican life, so that a piece of grung is a family's roots, security, and inheritance.
Examples
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Him plant yam an banana pon him grung.
He plants yam and banana on his land.
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Di ball drop pon di grung.
The ball fell on the ground.
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Country people work dem grung fi live.
Country people work their land to survive.
Origin
The Patois pronunciation of 'ground', keeping the older sense of 'ground' as cultivated land/a provision plot.
How it’s used
Means the ground/earth and, importantly, farmland/a provision ground. Rooted in rural life.