火山孝子 [－－－－]

Jyutping fo2 saan1 haau3 zi2
Pinyin huǒ shān xiào zǐ

Definitions (粵典–words.hk)
  1. 名詞、俚語
    周​時​喺​歡​場​流​連​，​好似​供養​妓女​噉​嘅​男子
    X; literally: volcano filial son
Definitions (Wiktionary)
  1. noun, Hong-Kong, Macau, slang
    brothel regular