飛來蜢 [飞来－]

Jyutping fei1 loi4 maang2
Pinyin fēi lái měng

Definitions (CC-CANTO)
  1. an unexpected good fortune
Definitions (粵典–words.hk)
  1. 語句
    自動​送​上​門​嘅​事
    an unexpected positive event; literally: a grasshopper flown in