Meaning
Nobody; no one — the Patois pronunciation of 'nobody'. 'Nuhbadi nuh deh yah' means 'nobody is here'. Note the standard Patois double negative ('nuhbadi nuh...'), which is grammatical, not an error. It can also mean a person of no importance ('him a nuhbadi').
Examples
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Nuhbadi nuh answer di door.
Nobody answered the door.
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Mi nuh tell nuhbadi.
I didn't tell anybody.
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Dem treat him like a nuhbadi.
They treated him like a nobody.
Origin
The Patois pronunciation of 'nobody'. The double negative ('nuhbadi nuh...') is standard Patois grammar.
How it’s used
Nobody/no one; double negatives are correct in Patois. Also 'a person of no standing'. Compare 'smaddy' (somebody).