Green’s Dictionary of Slang

(W.I.) ostentation, esp. in one’s dress; a smart person; thus as adj., stylish.

1902		J. Speirs Proverbs of British Guiana 38: Yanga gal full ob motions.
1916		J.G. Cruickshank Black Talk 9: Nyanga – A dude. To play the dude. ‘Boy, you is real nyanga.’.
1922		(con. late 19C) A. Gonzales Black Border 26: ’E call one dem nyang lady, ‘You got any match?’.
1929		M. Beckwith Jamaica Proverbs (1970) 91: Nyanga mek crab go sideways.
1950		Bennett, Clarke & Wilson Anancy Stories and Dialect Verse 41: All de fowl dem start fe yanga an merrenge roun’ de room.
2004		Guardian Rev. 23 Apr. 17: Wiley is ‘nang standard no doubt’.