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Jyutping gwaai3 suk1 suk1
Pinyin guài shú shu

Definitions (Wiktionary)
  1. noun
    strange-looking uncle; middle-aged paedophile

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Jyutping gwaai3 suk1 suk1
Pinyin guài shū shu

Definitions (CC-CEDICT)
  1. queer uncle, referring to a young to middle-aged male pedophile (Internet slang)
Definitions (粵典–words.hk)
  1. 名詞、潮語
    外表​或行​為​怪​異​嘅​中年男人
    a middle-aged man with strange behaviour or appearance
  2. 名詞、潮語
    外型​猥瑣​,​對​小朋友​或者​後​生仔​女不懷​好意​嘅​中年男人
    a weaselly or strange-looking middle-aged man who has ulterior motives towards young children or teenagers
  3. 近義詞
    金魚佬
Definitions (Wiktionary)
  1. noun
    strange-looking uncle; middle-aged paedophile
Examples (粵典–words.hk)
  1. Cantonese
    𠮶度有班怪叔叔 睺紧个啱啱放咗学嘅正太,我哋系咪应该报警?
    嗰度有班怪叔叔 睺緊個啱啱放咗學嘅正太,我哋係咪應該報警?
    go2 dou6 jau5 baan1 gwaai3 suk1 suk1 hau4 gan2 go3 aam1 aam1 fong3 zo2 hok6 ge3 zing3 taai3, ngo5 dei6 hai6 mai6 jing1 goi1 bou3 ging2?
    • There are some middle-aged men staring at a shota who just left the school. Should we call the police?