馬路炸彈 [马－－弹]

Jyutping maa5 lou6 zaa3 daan2
Pinyin mǎ lù zhà dàn

Definitions (粵典–words.hk)
  1. 名詞、俚語
    做出​非常​危險​駕駛行​為​嘅​司​機
    driver who demonstrates very dangerous skills; literally: road bomb