買板唔知埞 [买－－－－]

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Definitions (粵典–words.hk)
  1. 語句
    同買​棺材​唔​知​埞​同樣​意思​，​都​係​話​人​唔​識​死​，​做錯​嘢​仲​唔​知​；​「​板​」​代指​棺材
    an expression warning someone not to overstep the mark, literally "not knowing where to buy planks for coffin"

買板唔知埞 [买－－－－]

Jyutping maai5 baan2 m4 zi1 deng6
Pinyin mǎi bǎn n2 zhī dǐ

Definitions (CC-CANTO)
  1. what the hell are you playing at?; to act recklessly [colloquial]