Green’s Dictionary of Slang

nuh? excl.

also nuh true?

1. (W.I./UK black teen) a general interrog., i.e. ‘Isn’t that so?’.

[WI]cited in Cassidy & LePage Dict. Jam. Eng. (1980).

2. a ridiculing retort.

[US]Eble Campus Sl. Apr. 5: nuh – expression to ridicule a foolish statement.