Meaning
A stiff, moulded cornmeal or flour porridge, cooked thick and 'turned' (stirred hard) until it sets firm enough to shape — an old-time filling food eaten with soups and stews, similar to a firm turn-cornmeal or the West African 'fufu'. The reduplication echoes the repeated turning.
Examples
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Granny mek tun-tun fi go wid di fish.
Granny made tun-tun to go with the fish.
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Turn di cornmeal till it firm inna tun-tun.
Turn the cornmeal until it firms into tun-tun.
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Tun-tun heavy but it fill yuh up.
Tun-tun is heavy but it fills you up.
Origin
From 'turn-turn' — the repeated turning/stirring that stiffens the cornmeal; akin to West African fufu-style staples.
How it’s used
A stiff cornmeal/flour staple; related to turn-cornmeal. See [[turn-cornmeal]].