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Jyutping baat3 jyut6 sap6 ng5
Pinyin bā yuè shí wǔ

Definitions (CC-CANTO)
  1. the moon festival (the 15th day of the 8th lunar month); the slang for 'backside/buttocks'
Definitions (粵典–words.hk)
  1. 名詞、俚語
    滿月​,​引申​指​屁股​、​臀部​(​量​詞​:​個​)
    buttocks; literally "15th of the 8th month", in reference to the full moon at Mid-Autumn
    • 你洗乾淨個八月十五等坐監啦!
      你洗干净个八月十五等坐监啦!
      nei5 sai2 gon1 zeng6 go3 baat3 jyut6 sap6 ng5 dang2 co5 gaam1 laa1!
      Better rinse your ass and get ready for jail!
  2. 近義詞
    pat pat、囉柚、屁股、臀
  3. 名詞
    通常​指農​曆​八月​十五​,​即​係​中秋​節
    the 15th of the 8th month in the East Asian lunar calendar, also known as Mid-Autumn Festival
    • 八月十五你點過?
      八月十五你点过?
      baat3 jyut6 sap6 ng5 nei5 dim2 gwo3?
      How will you celebrate Mid-Autumn Festival?
Definitions (Wiktionary)
  1. noun, regional
    Mid-Autumn Festival
  2. noun, Cantonese, humorous
    buttocks (Classifier: 個/个 c)
    • 洗定个八月十五等坐监
      洗定个八月十五等坐监
      sai2 ding6 go3 baat3 jyut6 sap6 ng5 dang2 co5 gaam1
      (humorous) get ready for imprisonment (literally: wash your buttocks in preparation for sitting in jail)
Examples (粵典–words.hk)
  1. Cantonese
    我八月十五号生日。
    我八月十五號生日。
    ngo5 baat3 jyut6 sap6 ng5 hou6 saang1 jat6
    • My birthday is on 15th August.
  2. Cantonese
    农历八月十五系中秋节。
    農曆八月十五係中秋節。
    nung4 lik6 baat3 jyut6 sap6 ng5 hai6 zung1 cau1 zit3.
    • The Mid-Autumn Festival is on the 15th day of the 8th month of the Chinese calendar.
  3. Cantonese
    有晒人证物证,今次你洗干净八月十五等踎监啦!
    有晒人證物證,今次你洗乾淨八月十五等踎監啦!
    jau5 saai3 jan4 zing3 mat6 zing3, gam1 ci3 nei5 sai2 gon1 zeng6 baat3 jyut6 sap6 ng5 dang2 mau1 gaam1 laa1!
    • We've got all the eye witnesses and evidences, now you can clean your butt and prepare for imprisonment!
  4. Cantonese
    你洗干净个八月十五等坐监啦!
    你洗乾淨個八月十五等坐監啦!
    nei5 sai2 gon1 zeng6 go3 baat3 jyut6 sap6 ng5 dang2 co5 gaam1 laa1!
    • Better rinse your ass and get ready for jail!
  5. Cantonese
    八月十五你点过?
    八月十五你點過?
    baat3 jyut6 sap6 ng5 nei5 dim2 gwo3?
    • How will you celebrate Mid-Autumn Festival?
Examples (Wiktionary)
  1. Cantonese
    洗定个八月十五等坐监
    洗定个八月十五等坐监
    sai2 ding6 go3 baat3 jyut6 sap6 ng5 dang2 co5 gaam1
    • (humorous) get ready for imprisonment (literally: wash your buttocks in preparation for sitting in jail)