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Jyutping fun1 hei2 joek6 kwong4
Pinyin huān xǐ ruò kuáng

Definitions (Wiktionary)
  1. phrase, idiomatic
    Synonym of 欣喜若狂 (xīnxǐruòkuáng, “ecstatic; over the moon; overjoyed”).
    (syn.) 欣喜若狂