Meaning
Somebody, someone — the Patois pronunciation of 'somebody'. Beyond the plain sense, it also means a person of importance or standing: 'him tink him a smaddy' means he thinks he's someone special, and to want to 'be smaddy' is to want to amount to something in life. So the word runs from the ordinary 'some person' to the weightier idea of being a person of consequence, and the ambition to rise and 'turn smaddy' is a real thread in Jamaican striving.
Examples
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Smaddy deh a di door a knock.
Somebody's at the door knocking.
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Yuh cyaa trust everybody; some smaddy will let yuh down.
You can't trust everyone; some people will let you down.
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She work hard fi become a smaddy.
She worked hard to become someone (of standing).
Origin
The Patois pronunciation of 'somebody', compressed to 'smaddy'.
How it’s used
Means 'somebody/someone'; can also imply a person of importance ('a real smaddy').