Meaning
To grin or smile broadly, showing the teeth — literally to 'skin' (draw back) the lips off the teeth. As a noun, a 'kin-teeth' is a broad grin. It often carries a shade of judgement: a grin that is empty, nervous, or false, as in the proverb warning that 'kin-teeth nuh laugh' — a smiling face is not always a friendly heart. So it can be simple happy grinning, or a hollow, put-on smile.
Examples
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Wa mek yuh a kin-teeth so?
Why are you grinning like that?
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Kin-teeth nuh mean seh him a yuh friend.
A grin doesn't mean he's your friend.
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Di baby kin-teeth when him see him mumma.
The baby grinned when he saw his mother.
Origin
From 'kin/skin' (to draw back) + 'teeth'; to grin broadly. See [[suck-teeth]], [[bad-mind]].
How it’s used
To grin/smile broadly; can imply an empty or false smile. See [[suck-teeth]], [[bad-mind]].