Green’s Dictionary of Slang

(later use is UK black) Chinese, East Asian.

c.1920		‘Ching Chong’ at warrenfahey.com 🌐 Ching Chong chinaman / Washed his face in a frying pan.
1971		B. Moyers Listening to America 230: I felt singled out for my Chineseness, and I would get that Ching-Chong-Chinese thing.
1999		(con. 1979–80) A. Wheatle Brixton Rock (2004) 85: Japan, or one of those ching-chong countries.
2008		Mail & Guardian (Johannesburg) 24 July 🌐 As far as we’re concerned ‘ChingChong’ is the equivalent of the ‘K’ word.