Green’s Dictionary of Slang

1. a North African.

1968

A. Burgess Enderby Outside in Complete Enderby (2002) 302: One of the cab-nogs? Ahmed, was it?

2. a Vietnamese, orig. a North Vietnamese or Viet Cong soldier.

1982		(ref. to 1960s) J.J. Coe Desperate Praise 38: No nog bodies to bury, but your mates being loaded onto helicopters.
1991		(ref. to 1960s) Malahat Rev. 46: Ron had only word for the Vietnamese. All the Aussies did [...] It was a nog mine, a nog taxi, a nog ambush.
2005		(ref. to 1960s) A. Laugesen Diggerspeak 144: The term nog was widely used by the Australian soldiers to refer to the Vietnamese.

3. an Asian.

1953		Baker Aus. Speaks 178: The most notable neologisms from Korea have been nog and noggie, applied to a South Korean native.
1993		B. Moore Lex. of Cadet Lang. 245: usage: [...] 2. All those nogs from different parts of Asia have given us interesting food, but lots of them are into organised crime.