“哩勒公蝦毀” what does this mean?
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"