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Jyutping hung4 dai2
Pinyin hóng dǐ

Definitions (CC-CANTO)
  1. a Hong Kong HKD $100 banknote; red color background
Definitions (粵典–words.hk)
  1. 名詞
    一百​蚊
    one hundred dollar note
    • 紅底股
      红底股
      $100+ stock
  2. 名詞
    同中​國共產黨​有​關​嘅​背景
    background associated with the Chinese Communist Party
Definitions (Wiktionary)
  1. noun, Cantonese
    red underpants (often wore for good luck) (Classifier: 條/条)
  2. noun, Hong-Kong
    hundred-dollar banknote (Classifier: 張/张)
    (syn.) 红衫鱼, 紅衫魚
  3. adj, Hong-Kong
    having pro-CCP leanings
Examples (粵典–words.hk)
  1. Cantonese
    人哋话着红底会好运啲㗎。
    人哋話着紅底會好運啲㗎。
    jan4 dei6 waa6 zoek3 hung4 dai2 wui5 hou2 wan6 di1 gaa3.
    • People say wearing red underpants will bring you good luck.
  2. Cantonese
    新年着红底,够晒老利㖞。
    新年着紅底,夠晒老利喎。
    san1 nin4 zoek3 hung4 dai2, gau3 saai3 lou5 lai2 wo3.
    • The red panties are really some lucky charm to wear in Chinese New Year.
  3. Cantonese
    红底股
    紅底股
    • $100+ stock
Examples (Wiktionary)
  1. Cantonese
    红底
    紅底
    hung4 dai2
    • having pro-CCP leanings
    • red underpants