Meaning
To resemble or look like — 'him favor him fada' means he looks like his father. In Patois 'favor' is the everyday word for a physical resemblance or family likeness, a use once common in English but now old-fashioned there, and it extends to 'it favor like...', meaning 'it looks as though...'. So to 'favor' someone is to have their look in the face or the build, and the word does the plain daily work of noting who resembles whom and how a thing appears.
Examples
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Di baby favor him madda.
The baby looks like his mother.
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Yuh favor smaddy mi know.
You resemble someone I know.
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It favor like rain a go fall.
It looks as though rain is going to fall.
Origin
From an older English sense of 'favour' (to resemble), preserved in Patois where standard English has largely lost it.
How it’s used
Means 'resemble/look like'; 'it favor like...' = 'it looks as though...'. Also spelled 'fava'.