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Jyutping mong1 gwo2 jan4
Pinyin máng guǒ rén

Definitions (Wiktionary)
  1. noun, figuratively, neologism, slang
    “mango person” (yellow on both the outside and inside), a Chinese person born and/or raised overseas who has not forgotten one's roots, i.e. one who has retained an understanding and appreciation of Chinese culture