廚房階磚 [厨－阶砖]

Jyutping cyu4 fong2 gaai1 zyun1
Pinyin chú fáng jiē zhuān

Definitions (粵典–words.hk)
  1. 語句
    歇後語​，​意思​係​鹹​濕
    X; literally: tiles in the kitchen