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Jyutping kaai1 zi2
Pinyin kǎi zi

Definitions (粵典–words.hk)
  1. 名詞
    行為​愚蠢​到​好笑​嘅​人​(​量​詞​:​個​)
    (Degradatory) a retard
    • 阿松佢條數咁簡單都唔識計,正一凱子。
      阿松佢条数咁简单都唔识计,正一凯子。
      A-chung can't do such a simple math question. He's a retard.
  2. 參看
    kai子

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Jyutping hoi2 zi2
Pinyin kǎi zi

Definitions (CC-CEDICT)
  1. (slang) rich, good-looking guy
Definitions (Wiktionary)
  1. noun, slang
    fool; idiot
  2. noun, Taiwan, slang
    rich, good-looking guy
  3. noun, Taiwan, slang
    gigolo
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    笨蛋!她说她爱你不是真心的。还没有发现吗?她只是钓凯子的。
    笨蛋!她説她愛你不是真心的。還沒有發現嗎?她只是釣凱子的。
    bèn dàn ! tā shuō tā ài nǐ bú shi zhēn xīn de 。 hái méi yǒu fā xiàn ma ? tā zhǐ shì diào kǎi zi de 。
    • Idiot! She's not being honest when she says she loves you. Haven't you figured it out yet? She's just a gold digger.
Examples (粵典–words.hk)
  1. Cantonese
    阿松佢条数咁简单都唔识计,正一凯子。
    阿松佢條數咁簡單都唔識計,正一凱子。
    • A-chung can't do such a simple math question. He's a retard.