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Jyutping joeng4 joeng4 zi6 dak1
Pinyin yáng yáng zì dé

Definitions (CC-CEDICT)
  1. immensely pleased with oneself (idiom)
  2. proud
  3. complacent
Definitions (粵典–words.hk)
  1. 語句
    表現​得​非常​得意​,​神情​自滿
    to be triumphantly smug; to be self-satisfied
    • 佢符符碌碌,默書攞到個滿分就洋洋自得咁,真係見佢前邊就想打佢後邊。
      佢符符碌碌,默书攞到个满分就洋洋自得咁,真系见佢前边就想打佢后边。
      He got a full mark in dictation out of sheer luck and his shit eating smug is really infuriating.
Definitions (Wiktionary)
  1. phrase, idiomatic
    to be very pleased with oneself; to be self-satisfied
    (syn.) 沾沾自喜
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. Cantonese
    佢符符碌碌,默书攞到个满分就洋洋自得咁,真系见佢前边就想打佢后边。
    佢符符碌碌,默書攞到個滿分就洋洋自得咁,真係見佢前邊就想打佢後邊。
    • He got a full mark in dictation out of sheer luck and his shit eating smug is really infuriating.
Examples (Wiktionary)
  1. Mandarin
    洋洋自得
    洋洋自得
    yáng yáng zì dé
    • to be very pleased with oneself; to be self-satisfied