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Wiktionary
jook-sing

n. (cx pejorative English) An American or Canadian-born Chinese, whose native language is English and who has little or no command of Chinese languages.

Wikipedia
Jook-sing

Jook-sing or zuk-sing (竹升) is a Cantonese term for an overseas Chinese person who was born in a Western environment and/or a Chinese person who more readily or strongly identifies with Western culture than traditional Chinese culture.