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Jyutping mou5 gaa1 gaau3
Pinyin mǎo jiā jiào

Definitions (CC-CANTO)
  1. (adjective) ill-mannered; uncouth; to describe someone with vulgar behaviour (with the implication that his family did not raise or teach him well)
Definitions (粵典–words.hk)
  1. 語句
    指責​對方​家庭​唔​去​教識​某人​一​啲​一般​社交​禮儀​、​社會​規範​等​。
    to be badly behaved, to have bad manners
    • 同人講嘢記得要有禮貌,唔係因住俾人鬧你冇家教呀。
      同人讲嘢记得要有礼貌,唔系因住俾人闹你冇家教呀。
      tung4 jan4 gong2 je5 gei3 dak1 jiu3 jau5 lai5 maau6, m4 hai6 jan1 zyu6 bei2 jan4 naau6 nei5 mou5 gaa1 gaau3 aa3.
      You should be polite when talking to people. Otherwise, you might be blamed for having no manners.
  2. 近義詞
    有爺生,冇乸教
Definitions (Wiktionary)
  1. adj, Cantonese, of children
    ill-bred; having no manners; behaving poorly
    (syn.) 冇仔教
Definitions (Kaifangcidian)
  1. 沒教養 – 没教养
  2. 沒家教 – 没家教
  3. 不懂禮貌 – 不懂礼貌
Examples (粵典–words.hk)
  1. Cantonese
    你睇个阿妈咁冇文化,个女又冇家教,真系臭坑出臭草。
    你睇個阿媽咁冇文化,個女又冇家教,真係臭坑出臭草。
    nei5 tai2 go3 aa3 maa1 gam3 mou5 man4 faa3, go3 neoi2 jau6 mou5 gaa1 gaau3, zan1 hai6 cau3 haang1 ceot1 cau3 cou2.
    • Look, the mother is so uncivilised, and the daughter behaves poorly; (it's such a proof that) a smelly ditch grows smelly grass.
  2. Cantonese
    冇家教
    冇家教
    mou5 gaa1 gaau3
    • to be a spoiled brat
  3. Cantonese
    同人讲嘢记得要有礼貌,唔系因住俾人闹你冇家教呀。
    同人講嘢記得要有禮貌,唔係因住俾人鬧你冇家教呀。
    tung4 jan4 gong2 je5 gei3 dak1 jiu3 jau5 lai5 maau6, m4 hai6 jan1 zyu6 bei2 jan4 naau6 nei5 mou5 gaa1 gaau3 aa3.
    • You should be polite when talking to people. Otherwise, you might be blamed for having no manners.