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Jyutping paak3 on3 ging1 kei4
Pinyin pāi àn jīng qí

Definitions (CC-CEDICT)
  1. to slap the table in amazement (idiom); wonderful!
  2. amazing!
Definitions (Wiktionary)
  1. phrase, figuratively, idiomatic
    to be surprised by the excellence (of something)