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Jyutping cou2 nai4 maa5
Pinyin cǎo ní mǎ

Definitions (CC-CEDICT)
  1. grass mud horse
  2. used as a substitute for 肏你媽|肏你妈[cao4 ni3 ma1], to mock or avoid censorship on the Internet
Definitions (Wiktionary)
  1. intj, Mandarin, euphemistic
    fuck your mother
  2. noun, Mandarin, slang
    frustration; anger
    • 我心中有千萬只草泥馬在奔騰。
      我心中有千万只草泥马在奔腾。
      wǒ xīn zhōng yǒu qiān wàn zhī cǎo ní mǎ zài bēn téng .
      I am deeply frustrated. (literally "In my heart there are many Caonima galloping")
  3. noun, slang
    alpaca
Examples (Wiktionary)
  1. Mandarin
    我心中有千万只草泥马在奔腾。
    我心中有千萬只草泥馬在奔騰。
    wǒ xīn zhōng yǒu qiān wàn zhī cǎo ní mǎ zài bēn téng .
    • I am deeply frustrated. (literally "In my heart there are many Caonima galloping")