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Jyutping sei2 ding6
Pinyin sǐ dìng

Definitions (CC-CEDICT)
  1. to be screwed
  2. to be toast
Definitions (Wiktionary)
  1. verb
    to be doomed; to be screwed; to be toast
    (syn.) 死梗
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    哎,马上就要考试了。我死定了!
    哎,馬上就要考試了。我死定了!
    āi , mǎ shàng jiù yào kǎo shì le 。 wǒ sǐ dìng le !
    • Ah, it's almost time for exams. I'm dead!
  2. Mandarin
    你死定了。
    你死定了。
    nǐ sǐ dìng le 。
    • You are screwed.
Examples (粵典–words.hk)
  1. Cantonese
    你实系想死定嘞。
    你實係想死定嘞。
    nei5 sat6 hai6 soeng2 sei2 ding2 laak3.
    • (Judging from what you are trying to do) You must be longing to die.