Meaning
A matter, issue, or what's wrong — the Patois pronunciation of 'matter'. 'Wah di matta?' means 'what's the matter / what's wrong?'. 'Matta a fak' (matter of fact) introduces a point of truth. Used both for a problem and for a subject under discussion.
Examples
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Wah di matta wid yuh?
What's the matter with you?
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Matta a fak, mi did deh deh miself.
As a matter of fact, I was there myself.
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It nuh matta, leave it.
It doesn't matter, leave it.
Origin
The Patois pronunciation of 'matter'; 'matta a fak' = matter of fact.
How it’s used
A matter/problem ('wah di matta?'); 'matta a fak' = as a matter of fact. Compare 'wam', 'sinting'.