Meaning
Of hair: short, tightly-coiled, and matted or unkempt — 'picky-picky head' describes very kinky, nappy hair, especially when it hasn't been combed or groomed. Can also mean over-fussy or choosy about small things, though the hair sense is the main one.
Examples
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Comb di pickney picky-picky head before school.
Comb the child's nappy hair before school.
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Him hair grow out all picky-picky.
His hair grew out all short and kinky.
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She too picky-picky bout weh she eat.
She's too fussy about what she eats.
Origin
A reduplication suggesting many tight little points or 'picks' of coiled hair; the 'fussy' sense comes from the English 'picky'.
How it’s used
Chiefly of tightly-coiled/unkempt hair ('picky-picky head'); secondarily 'fussy/choosy'. Descriptive, but can sound critical.