觀音頭掃把腳 [观－头扫－脚]

Jyutping gun1 jam1 tau4 sou3 baa2 goek3
Pinyin guān yīn tóu sào bǎ jiǎo

Definitions (粵典–words.hk)
  1. 語句
    形容​人​或者​事物​頂頭​好好​，​後​半好​衰
    used to describe a person or object that only looks good on top but not underneath
  2. 反義詞
    倒食甘蔗