“哩勒公蝦毀” what does this mean? What does “哩勒公蝦毀” mean? A Taiwanese guy said that to me after I had, accidently, mistyped two words in an idiom I used on him.

He also used an expression of surprise (I presume) which went like “蛤？！” (after I said he seemed like a guy whom a conversation would get easily boring with) What does that mean too?
哩勒公蝦毀

This sentence refers to the pronunciation of "What did you say?" in Min-Nan


哩(ㄌㄧ): You 
勒(ㄌㄟ): an auxiliary verb 
公(ㄍㄨㄥ): say
蝦毀(ㄒㄧㄚ ㄏㄨㄟˇ): what


蛤？！

This word equals to "Huh? Could you speak up?". Taiwanese use this word commonly on the Internet because it's the first word choice in Bopomofo input method of "ㄏㄚˊ"