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Jyutping siu2 dai6 dai6
Pinyin xiǎo dì di

Definitions (CC-CEDICT)
  1. little brother
  2. little boy
  3. (coll.) penis
Definitions (Wiktionary)
  1. noun
    young boy
  2. noun, euphemistic, informal
    penis; dick
  3. noun
    youngest younger brother
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    我肯定他的小弟弟很小。
    我肯定他的小弟弟很小。
    wǒ kěn dìng tā de xiǎo dì di hěn xiǎo 。
    • I'm sure his brother is very young.