Meaning
A small, roughly built hut or shed of board and zinc — humble one-room housing, or a little roadside stall or bar knocked together from scrap materials. To live in a shack is to live poor and plain, and many a country rum-shop or vendor's stand is a simple shack by the road. In its other sense, to 'shack up' is to move in and live with a partner without marrying, and the word carries the makeshift, informal feeling common to both.
Examples
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Him live inna a likkle board shack.
He lives in a little wooden shack.
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Dem sell fish from a shack by di sea.
They sell fish from a shack by the sea.
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Di couple shack up together.
The couple moved in together.
Origin
From 'shack' (a rough hut); 'shack up' (to cohabit) is a common extended sense.
How it’s used
A rough hut or small stall; 'shack up' = live together unmarried. Compare 'board house', 'zinc fence'.