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Jyutping dak1 ji3 mong4 jing4
Pinyin dé yì wàng xíng

Definitions (CC-CEDICT)
  1. so pleased as to lose one's sense of measure
  2. beside oneself with joy
Definitions (粵典–words.hk)
  1. 形容詞
    因為​高興​而​失去​常態
    so joyful as to act abnormally
    • 佢中咗大獎之後得意忘形,亂咁講嘢。
      佢中咗大奖之后得意忘形,乱咁讲嘢。
      keoi5 zung3 zo2 daai6 zoeng2 zi1 hau6 dak1 ji3 mong4 jing4, lyun6 gam3 gong2 je5.
      After he got the big prize, he was so joyful that he talked senselessly.
Definitions (Wiktionary)
  1. phrase, idiomatic
    to be so excited that one gets carried away
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. Cantonese
    得意忘形
    得意忘形
    dak1 ji3 mong4 jing4
    • to let success go to one's head
  2. Cantonese
    佢中咗大奖之后得意忘形,乱咁讲嘢。
    佢中咗大獎之後得意忘形,亂咁講嘢。
    keoi5 zung3 zo2 daai6 zoeng2 zi1 hau6 dak1 ji3 mong4 jing4, lyun6 gam3 gong2 je5.
    • After he got the big prize, he was so joyful that he talked senselessly.