電燈柱掛老鼠箱 [电灯－挂－－－]

Jyutping din6 dang1 cyu5 gwaa3 lou5 syu2 soeng1
Pinyin diàn dēng zhù guà lǎo shǔ xiāng

Definitions (粵典–words.hk)
  1. 語句
    形容​情侶​生得​一​高一​矮​，​身高​差得​遠
    to describe a couple with a large difference in height; literally: light post hanging a rat box