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Jyutping hyut3 hei3 fong1 gong1
Pinyin xuě qì fāng gāng

Definitions (Wiktionary)
  1. phrase, idiomatic, of youth, usually
    hot-blooded; full of vigour; buoyant and impetuous

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Jyutping hyut3 hei3 fong1 gong1
Pinyin xuè qì fāng gāng

Definitions (CC-CEDICT)
  1. full of sap (idiom); young and vigorous
Definitions (粵典–words.hk)
  1. 形容詞
    形容​人年​輕​,​做事​衝動​,​考慮​唔​周到
    (of teenagers, young adults) courageous and upright, yet impetuous and ready to start a quarrel; full of spirit, full of vigour; in the prime of life
    • 後生仔血氣方剛,做事容易衝動。
      后生仔血气方刚,做事容易冲动。
      hau6 saang1 zai2 hyut3 hei3 fong1 gong1, zou6 si6 jung4 ji6 cung1 dung6.
      Teenagers are full of spirit and vigour, and are therefore usually more impetuous.
Definitions (Wiktionary)
  1. phrase, idiomatic, of youth, usually
    hot-blooded; full of vigour; buoyant and impetuous
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. Cantonese
    后生仔血气方刚,做事容易冲动。
    後生仔血氣方剛,做事容易衝動。
    hau6 saang1 zai2 hyut3 hei3 fong1 gong1, zou6 si6 jung4 ji6 cung1 dung6.
    • Teenagers are full of spirit and vigour, and are therefore usually more impetuous.