個腦生喺屎忽度 [个脑－－－－－]

Jyutping go3 nou5 saang1 hai2 si2 fat1 dou6
Pinyin gè nǎo shēng xí shǐ hū dù

Definitions (粵典–words.hk)
  1. 語句
    指一個​人​好​蠢​、​唔​用腦​諗​嘢
    very dumb, very stupid; never use one's brain; literally: the brain is located at the ass