Meaning
Literally 'I am here' — the standard, steady reply to a greeting, meaning roughly 'I'm all right', 'I'm getting by', or 'still here'. When someone asks 'wah gwaan?', 'mi deh yah' answers that you are holding on, present and coping, without claiming things are wonderful. It signals quiet steadiness and endurance rather than excitement, the plain report of someone still standing and pushing through, and it is one of the most common exchanges in everyday Jamaican greeting.
Examples
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— Wah gwaan? — Mi deh yah, yuh know.
— What's going on? — I'm here, you know.
The classic greeting-and-response pair.
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Mi deh yah a wait pon yuh.
I am here waiting on you.
Used literally, to state physical presence.
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Tings tough but mi deh yah.
Things are tough but I'm managing.
Origin
From English "me there here": deh functions as the Patois locative/continuous marker (from "there"), and yah means "here". Patois often marks location and ongoing action with deh rather than a form of the verb "to be".
How it’s used
Understated by design. Answering "mi deh yah" to "wah gwaan" is the safest, most natural reply in almost any casual situation. Adding "yuh know" at the end softens it further.