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Jyutping fai3 mat6 dim2 sam1
Pinyin fèi wù diǎn xin

Definitions (Wiktionary)
  1. noun, derogatory, dialectal
    useless person; mentally retarded person

廢物點心 [废-点-]

Jyutping
Pinyin fèi wù diǎn xin

Definitions (CC-CEDICT)
  1. (coll.) a good-for-nothing; a loser