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Jyutping waat3 bei6 zi2
Pinyin wā bí zi

Definitions (CC-CEDICT)
  1. to pick one's nose
Definitions (Wiktionary)
  1. verb
    to pick one's nose
    (syn.) 撩鼻屎, 挖鼻, 抠鼻子, 摳鼻子