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Jyutping nei5 hoi1 sam1 zau6 hou3
Pinyin nǐ kāi xīn jiù hǎo

Definitions (Wiktionary)
  1. phrase, Internet, ironic
    Fuck you, asshole! / It's good to see that you are entertaining yourself.
    (syn.) 你高兴就好, 你高興就好