Green’s Dictionary of Slang

nauky adj.

also knackety, knacky, knawky, nacky, nawky
[Scot. knaw; ult. SE know]

cunning, resourceful.

[UK]Grose Classical Dict. of the Vulgar Tongue n.p.: nacky ingenious.
[UK]Lex. Balatronicum [as cit. 1785].
[UK]Egan Grose’s Classical Dict. of the Vulgar Tongue [as cit. 1785.
[UK]Vulgarities of Speech Corrected (2009) 169: To be nacky, or to have a nack, To be dextrous or expert.
[US]Matsell Vocabulum [as cit. 1785].
[Ire]Share Slanguage 195/2: nauky/nawky/knacky/knawky/knackety [...] (Ulster). Cute, cunning, skilful, resourceful.