Definition of pak pai in English:

pak pai

noun

historical
  • In Hong Kong: a car used illegally as a taxi.

Origin

1970s; earliest use found in The South China Morning Post. From Chinese (Cantonese) baahk báai (Meyer-Wempe transcription paâk p'áai), lit. ‘white (vehicle) number plate’ from baahk white + báai sign, notice, referring to the colour of the non-commercial (vehicle) number plates used in Hong Kong.

Pronunciation

pak pai

/ˌpak ˈpʌɪ/