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Jyutping tong4 ci1 dau6
Pinyin táng chī dòu

Definitions (Wiktionary)
  1. adj, Cantonese, figuratively
    inseparable; as thick as thieves

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Jyutping tong4 ci1 dau2
Pinyin táng chī dòu

Definitions (CC-CANTO)
  1. (noun) (adjective) (of good friend or a couple) undividable; inseparable; conjoined
Definitions (粵典–words.hk)
  1. 名詞
    兩個​或者​或​以上​關​係​親密​,​成日​一齊​出現​,​黐​埋​一​齊​嘅​人​(​量​詞​:​粒​、​對​、​pair​)
    two or more people who always appear together; two people who are very close or intimate; literally, sugar stick with bean
    • 佢哋兩粒糖黐豆,去邊都要一齊。
      佢哋两粒糖黐豆,去边都要一齐。
      keoi5 dei6 loeng5 nap1 tong4 ci1 dau2, heoi3 bin1 dou1 jiu3 jat1 cai4.
      Both of them are very close friends; wherever they go they stick together.
  2. 名詞
    一種​團體​遊戲​;​主持人​會​講糖​黐​豆​數目​,​玩​嘅​人​要​跟​住​數​目​分​組​,​單丁​咗​,​唔​符合​人數​要求​嘅​就​會​輸
    a type of group game that the host calls out a number and then participants form groups with a certain size according to that number, people who are singled out or cannot form the required group will lose
Definitions (Kaifangcidian)
  1. 形影不離 – 形影不离
  2. 如膠似漆 – 如胶似漆
  3. 親密無間 – 亲密无间
Examples (粵典–words.hk)
  1. Cantonese
    佢哋两粒糖黐豆,去边都要一齐。
    佢哋兩粒糖黐豆,去邊都要一齊。
    keoi5 dei6 loeng5 nap1 tong4 ci1 dau2, heoi3 bin1 dou1 jiu3 jat1 cai4.
    • Both of them are very close friends; wherever they go they stick together.
  2. Cantonese
    佢哋两婆孙好似糖黐豆咁,打风都打唔甩。
    佢哋兩婆孫好似糖黐豆咁,打風都打唔甩。
    keoi5 dei6 loeng5 po4 syun1 hou2 ci5 tong4 ci1 dau2 gam2, daa2 fung1 dou1 daa2 m4 lat1
    • .)
    • They, the (maternal) grandma and grandson, are like bean stuck with sugar. They are never separated.