瘋掉 [疯－]

Jyutping fung1 diu6
Pinyin fēng diào

Definitions (Wiktionary)
  1. verb
    to go crazy; to go off the rails; to go mad
    (syn.) 抓狂
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    他完全疯掉了。
    他完全瘋掉了。
    tā wán quán fēng diào le 。
    • He's completely lost his mind.