"灰常"means "非常"in Chinese,,,,"灰常" is widely used in student-spoken language and our student or friends life,but it cannot be written in articles^^We just speak that way.
2010年12月3日
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because of a certain dialect from southern china that 非" fei" sounds like 灰"hui"
非常 is commonly spoken as 灰常
people think it's fun to say it in this way. But it'll be odd to hear in formal circumstances.