Sergio is right. But I think it must be: "Lavate el hoyo". Personally, I find this expression very rude and offensive. Regarding: "Fea culia". It seems to be a kind of chilean slang. The meaning could be: "Ugly and stupid". As the above, an expression very rude and offensive. It is used when a guy offends to a girl, saying "tu eres una vieja fea culia", I think.

Hi I am a native spanish speaker I can help you with the first phrase. labate el oyo = wash your ass hole. That's the meaning in a general context. I wish it has answered your question.