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Jyutping sam6 mo1 gwai2
Pinyin shén me guǐ

Definitions (Wiktionary)
  1. pron, emphatic
    what; what the hell
    (syn.) 乜鬼
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    这辆有点怪的车让我脱口而出"那是什么鬼东西啊?"
    這輛有點怪的車讓我脫口而出"那是什麼鬼東西啊?"
    zhè liàng yǒu diǎn guài de chē ràng wǒ tuō kǒu ér chū " nà shi shén me guǐ dōng xī a ?"
    • It was the sort of weird car that made me want to blurt out, "what the heck is that?"
  2. Mandarin
    今天是什么鬼天气啊!
    今天是什麼鬼天氣啊!
    jīn tiān shì shén me guǐ tiān qì a !
    • It's filthy weather today!
  3. Mandarin
    你在说什么鬼话?
    你在説什麼鬼話?
    nǐ zài shuō shén me guǐ huà ?
    • What the hell are you talking about?
    • What nonsense are you talking about?
  4. Mandarin
    你在搞什么鬼。
    你在搞什麼鬼。
    nǐ zài gǎo shén me guǐ 。
    • What the devil are you doing?
Examples (Wiktionary)
  1. Mandarin
    什么鬼233
    什麼鬼233
    shén me guǐ 233
    • what the hell LOL
  2. Mandarin
    你在搞什么鬼?
    你在搞什麼鬼?
    nǐ zài gǎo shén me guǐ ?
    • What the hell are you doing?