Meaning
A fused contraction of 'do it', treated as a single word meaning to do or get something done. It carries an encouraging, get-on-with-it feeling — 'just dweet' is 'just do it, go for it, make it happen' — and it turns up constantly in the language of striving, hustle, and taking one's chance. Compact and punchy, 'dweet' packs the whole push toward action into one word, urging a person to stop hesitating and simply carry the thing through.
Examples
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Stop talk an dweet.
Stop talking and do it.
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If yuh believe inna it, dweet.
If you believe in it, do it.
Often used as encouragement.
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Mi cyaa dweet by miself.
I can't do it by myself.
Origin
A fusion of English 'do it', in which the two words collapse into one — a common process in Jamaican, as in 'gwaan' (go on) and 'cyaa' (can't).
How it’s used
Informal and punchy. Best in speech and casual writing rather than formal contexts.