菠蘿釘 [－萝钉]

Jyutping bo1 lo4 deng1
Pinyin bō luó dīng

Definitions (CC-CANTO)
  1. spikes on a pineapple
Definitions (粵典–words.hk)
  1. 名詞
    毫無價​值​嘅​人​或者​嘢​；​菠蘿批​皮​嘅​時​候​會​批​埋​啲​釘​，​由此​引申
    thing or person that is completely useless