妖孽你好
[yāo niè nĭ hăo]
In Chinese online slang, “妖孽” (yāo niè) literally means 'demon' or 'fiend,' but it can be used playfully to describe someone who is exceptionally good at something or behaves out of the ordinary. So '妖孽你好' translates roughly to 'Greetings, you incredible/demon person', often in an admiring and casual tone.