Meaning
'A suh it guh' — that's how it goes. An expression of acceptance that things simply are the way they are, for better or worse, used to shrug off what cannot be changed or to confirm that yes, that is exactly how a thing is done or how it happened. Close to 'a so it go' and 'such is life', it makes a weary, philosophical peace with hardship, disappointment, or the plain fixed order of things, and it carries the resigned wisdom of a people long practised in accepting what they cannot alter.
Examples
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Life nuh always fair, but a suh it guh.
Life isn't always fair, but that's how it goes.
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Dem win dis time; a suh it guh.
They won this time; that's just how it is.
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Yuh do di work an get pay — a suh it guh.
You do the work and get paid — that's how it goes.
Origin
'A' (it is) + 'suh' (so) + 'it guh' (it goes) — literally 'it is so it goes', an expression of how things stand.
How it’s used
Used for acceptance of the unchangeable, or to confirm 'that's just how it is'. Compare 'a suh it set'.