爛泥扶唔上壁 (laan6 nai4 fu4 m4 soeng5 bek3) — (derogatory slang) (with figurative meaning) when someone is lacking in ability / motivation, he/she will not be successful no matter how others help them; you can't make a silk purse out of a sow's ear in Cantonese
laanˍ₆爛naiˎ₄泥fuˎ₄扶mˎ₄唔soengˏ₅上bek˗₃壁简 烂泥扶唔上壁
Mandarin Pinyin: lan4 ni2 fu2 m2 shang4 bi4
Meaning of 爛泥扶唔上壁
noun(derogatory slang) (with figurative meaning) when someone is lacking in ability / motivation, he/she will not be successful no matter how others help them; you can't make a silk purse out of a sow's ear