'what did you get in for?' (a question usually asked to prisoners) / 'what crime did you commit?' [colloquial]
Definitions (粵典–words.hk)
語句、俚語
問一個坐緊監嘅人佢究竟犯咩事坐監 a question asked in the police station or prison, as a way of finding out the crime that addressee is said to have committed; "what did they get your for?", "what are you in for?"
你衰邊瓣，要坐成十年咁耐。
你衰边瓣，要坐成十年咁耐。
What have you done, stuck in here for ten years.