除褲放屁 [－裤－－]

Jyutping ceoi4 fu3 fong3 pei3
Pinyin chú kù fàng pì

Definitions (粵典–words.hk)
  1. 語句、俚語
    比喻​為​多餘​、​無謂
    unnecessary and pointless; literally: to take off the pants farting
Definitions (Wiktionary)
  1. phrase, Cantonese, idiomatic
    to do something unnecessary
    (syn.) 脫褲子放屁, 脱裤子放屁