食碗麵反碗底 (sik6 wun2 min6 faan2 wun2 dai2) — to return one's kindess with ingratitude and betrayal in Cantonese
sikˍ₆食wunˊ²碗minˍ₆麵faanˊ²反wunˊ²碗daiˊ²底简 食碗面反碗底
Mandarin Pinyin: shi2 wan3 mian4 fan3 wan3 di3
Meaning of 食碗麵反碗底
nounto return one's kindess with ingratitude and betrayal