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Jyutping duk6 nan2
Pinyin dú niǎn

Definitions (Wiktionary)
  1. noun, Cantonese, Hong-Kong, neologism, slang, vulgar
    lonely boy or man; dork; nerdy boy or man who women are generally not interested in (Classifier: 個/个; 條/条)
    (syn.) 宅男, 毒男

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Jyutping duk6 lan2
Pinyin dú niǎn

Definitions (粵典–words.hk)
  1. 名詞、潮語、粗俗
    對​一​啲​性格​內向怕醜​,​通常​係​興趣​偏門​並且​唔​受歡​迎​嘅​人​(​尤其​係​男性​)​嘅​貶​稱​(​量​詞​:​個​/​條​)
    nerd; otaku; derogatory term for introverts (usually male) who are unpopular and interested in nerdy stuff; literally, poisonous dick
    • 個毒撚完全唔識同人溝通。
      个毒撚完全唔识同人沟通。
      go3 duk6 lan2 jyun4 cyun4 m4 sik1 tung4 jan4 kau1 tung1.
      That nerd doesn't know how to communicate with others at all.
    • 其實毒撚一個更開心,使撚你講。(改編歌詞)
      其实毒撚一个更开心,使撚你讲。(改编歌词)
      kei4 sat6 duk6 lan2 jat1 go3 gang3 hoi1 sam1, sai2 lan2 nei5 gong2.
      A nerd feels happier to be left alone, needs no fucking explanation. (adapted from lyrics)
  2. 近義詞
    毒、毒男
Examples (粵典–words.hk)
  1. Cantonese
    毒撚识春乜嘢系名牌咩?
    毒撚識春乜嘢係名牌咩?
    duk6 lan2 sik1 ceon1 mat1 je5 hai6 ming4 paai4 me1?
    • Nerds don't know jack about big brands!
  2. Cantonese
    毒撚
    毒撚
    duk6 lan2
    • diffident introvert
  3. Cantonese
    飞机杯真系我呢啲毒撚嘅福音。
    飛機杯真係我呢啲毒撚嘅福音。
    fei1 gei1 bui1 zan1 hai6 ngo5 ni1 di1 duk6 lan2 ge3 fuk1 jam1.
    • Fleshlights are the savior of nerds like me.
  4. Cantonese
    个毒撚完全唔识同人沟通。
    個毒撚完全唔識同人溝通。
    go3 duk6 lan2 jyun4 cyun4 m4 sik1 tung4 jan4 kau1 tung1.
    • That nerd doesn't know how to communicate with others at all.
  5. Cantonese
    其实毒撚一个更开心,使撚你讲。(改编歌词)
    其實毒撚一個更開心,使撚你講。(改編歌詞)
    kei4 sat6 duk6 lan2 jat1 go3 gang3 hoi1 sam1, sai2 lan2 nei5 gong2.
    • A nerd feels happier to be left alone, needs no fucking explanation. (adapted from lyrics)