洗定個八月十五 [－－个－－－－]

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Definitions (CC-CANTO)
  1. prepare yourself for jail!; see you in jail [colloquial]
Definitions (粵典–words.hk)
  1. 動詞、俚語
    準備​坐監​；​八月​十五​即​係​屁股​，​據​説​坐​監​會​俾​人​通​櫃​（​現已​廢除​）​或者​強姦​，​所以​要​洗​乾淨​屁股​被​人​插
    to prepare oneself for a jail sentence; literally: to wash one's behind in preparation for going to jail
  2. 近義詞
    洗定籮柚
  3. 參看
    洗定八月十五