Meaning
A stone or a rock. Where English says simply 'stone', Jamaican doubles it to 'rockstone', a fuller, more emphatic word for the same thing. To 'throw rockstone' is to throw stones, 'hard like rockstone' means very hard indeed, and the country and the gully alike are full of rockstone underfoot. The reduplication is typical of the language's fondness for solid, picture-making compounds, and 'rockstone' is simply the ordinary, everyday word for any stone, from a pebble to a boulder.
Examples
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Di bwoy dem a throw rockstone.
The boys are throwing stones.
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Di dumpling hard like rockstone.
The dumpling is as hard as a rock.
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Mind yuh buck yuh toe pon di rockstone.
Mind you don't stub your toe on the stone.
Origin
A compound of 'rock' and 'stone', doubled for emphasis in the common Jamaican way.
How it’s used
The everyday word for a stone. 'Hard like rockstone' is a common comparison for anything very hard.