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Jyutping m4 gam2 dong1
Pinyin wú gǎn dāng

Definitions (粵典–words.hk)
  1. 語句
    唔​敢​擔當​、​接受​人​哋​嘅​讚​賞​、​獎賞​。​多數​用以​表示​謙​讓​。
    (pol.) used as a reply after a compliment; not worthy of such compliments; not at all; I don't deserve it
    • 「你拎呢個獎真係實至名歸。」「唔敢當唔敢當。」
      「你拎呢个奖真系实至名归。」「唔敢当唔敢当。」
      "You certainly deserve this award." "Not at all, not at all."
Definitions (Wiktionary)
  1. intj, Cantonese
    You flatter me; I wouldn't presume; I don't deserve this (praise, reward etc.)
    (syn.) 不敢當, 不敢当

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Jyutping m4 gam2 dong1
Pinyin n2 gǎn dāng

Definitions (CC-CANTO)
  1. do not dare to be, do not dare to deserve
Examples (粵典–words.hk)
  1. Cantonese
    「你拎呢个奖真系实至名归。」「唔敢当唔敢当。」
    「你拎呢個獎真係實至名歸。」「唔敢當唔敢當。」
    • "You certainly deserve this award." "Not at all, not at all."