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Jyutping mat1 dou1 gaa2
Pinyin miē dōu jiǎ

Definitions (CC-CANTO)
  1. (slang) (of object) everything is fake; all are fake; (of event) a phrase to express how resolute someone is to stand one's ground which cannot be compromised, with an intention somewhat similar to telling others not to even bother; to describe a situation where there are no solutions or alternatives: there's no way out / cannot be helped; a phrase used to ascertain others any alternatives are pointless / ineffective / not worth the effort: of no use / of no good; interjection no way!; not possible!;
Definitions (粵典–words.hk)
  1. 語句
    帶出​大前提​,​冇​咗​大前提​做​其他​嘢​都​係​徒然
    everything will be meaningless / the plan will fail (unless a particular condition is met); literally: everything is fake
    • 冇錢就乜都假。
      冇钱就乜都假。
      mou5 cin2 zau6 mat1 dou1 gaa2.
      Nothing's got without money.
    • 乜都假,裝多啲水先。
      乜都假,装多啲水先。
      mat1 dou1 gaa2, zong1 do1 di1 seoi2 sin1.
      Anyway load some more water first.
  2. 參看
    咩都假
Definitions (Wiktionary)
  1. phrase, Cantonese
    everything else is trivial; everything else is a trifling matter
    • 揾定水桶半打,装多啲水,乜都假
      揾定水桶半打,装多啲水,乜都假
      wan2 ding6 seoi2 tung2 bun3 daa1, zong1 do1 di1 seoi2, mat1 dou1 gaa2
      Find six buckets and fill them with more water; nothing else matters
Definitions (Kaifangcidian)
  1. 說啥也不行 – 说啥也不行
  2. 怎麼說也不行 – 怎么说也不行
  3. 說什麼也沒用 – 说什么也没用
  4. 沒辦法 – 没办法
  5. 做什麼也白搭 – 做什么也白搭
  6. 白費力氣 – 白费力气
Examples (粵典–words.hk)
  1. Cantonese
    冇钱就乜都假。
    冇錢就乜都假。
    mou5 cin2 zau6 mat1 dou1 gaa2.
    • Nothing's got without money.
  2. Cantonese
    乜都假,装多啲水先。
    乜都假,裝多啲水先。
    mat1 dou1 gaa2, zong1 do1 di1 seoi2 sin1.
    • Anyway load some more water first.
Examples (Wiktionary)
  1. Cantonese
    揾定水桶半打,装多啲水,乜都假
    揾定水桶半打,装多啲水,乜都假
    wan2 ding6 seoi2 tung2 bun3 daa1, zong1 do1 di1 seoi2, mat1 dou1 gaa2
    • Find six buckets and fill them with more water; nothing else matters