pak pai
/ˌpak ˈpʌɪ/Now historical
noun
In Hong Kong: a car used illegally as a taxi.
- Occasionally used with reference to other countries..
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.