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Jyutping hek3 hoeng1 ziu1
Pinyin chī xiāng jiāo

Definitions (Wiktionary)
  1. verb, literally
    to eat a banana
  2. verb, figuratively, slang
    to give a blowjob
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    猫不吃香蕉。
    貓不吃香蕉。
    māo bù chī xiāng jiāo 。
    • Cats don't eat bananas.