Green’s Dictionary of Slang

picky-picky head n.

also picky head

(W.I.) very short hair growing close to the scalp in small balls of fluff.

[WI]cited in Cassidy & LePage Dict. Jam. Eng. (1980).
[WI]F. Collymore Notes for Gloss. of Barbadian Dial. 87: Picky-head. Applied to Negress who wears her hair short.