Meaning
'Turned cornmeal' — cornmeal stirred ('turned') into a stiff, savoury mound as it cooks down with seasoning, coconut milk, and often saltfish, okra, or callaloo, much like a Caribbean polenta or the West African 'turn' staples. A hearty, economical one-pot dish; 'tun' is the Patois for 'turn'.
Examples
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She a tun cornmeal wid saltfish an okra.
She's making turn cornmeal with saltfish and okra.
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Keep tun di cornmeal so it nuh lump.
Keep stirring the cornmeal so it doesn't lump.
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Tun cornmeal fill yuh cheap an good.
Turn cornmeal fills you cheaply and well.
Origin
From 'turn' (tun) — stirred stiff — + 'cornmeal'; part of the 'turn' family of stirred staples of African origin. See [[cornmeal]], [[saltfish]].
How it’s used
Cornmeal stirred stiff with seasoning (like polenta); 'tun' = turn. See [[cornmeal]], [[saltfish]].