Meaning
Something — the Patois pronunciation of 'something'. 'Him have sinting fi yuh' means he has something for you, and to want 'a sinting' is to want a thing or a bite to eat. It can also hint vaguely at a matter or affair — 'a sinting a gwaan' means something is going on, some business or trouble is afoot. Among the most common everyday words, it does the plain work of 'something' while also carrying that useful vagueness for a thing not named, a hint dropped without saying more.
Examples
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Mi have sinting fi tell yuh.
I have something to tell you.
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A sinting a gwaan weh dem nah say.
Something is going on that they're not saying.
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Yuh want sinting fi eat?
Do you want something to eat?
Origin
The Patois pronunciation of 'something', compressed to 'sinting' (also heard as 'sup'm').
How it’s used
Means 'something'; can carry a hint of an unspoken matter ('a sinting a gwaan').