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Jyutping gong2 gik6 dou1 m4 ming4
Pinyin jiǎng jí dōu n2 míng

Definitions (CC-CANTO)
  1. to be unable to get through to someone; to talk to a brick wall [colloquial]
Examples (粵典–words.hk)
  1. Cantonese
    你咁stupid㗎,讲极都唔明嘅。
    你咁stupid㗎,講極都唔明嘅。
    nei5 gam3 si6 diu1 bat4 gaa3, gong2 gik6 dou1 m4 ming4 ge2.
    • Why are you so stupid that you understand nothing!
Examples (Wiktionary)
  1. Cantonese
    讲极都唔明
    講極都唔明
    gong2 gik6 dou1 m4 ming4
    • not understand despite lengthy explanation