Many people here have been saying 'pain the the ar......'. Why that part of body? I wrote it, that word, only ar.... because I was not sure if it would be rude. Sometimes a friend of mine who is a native speaker said that Arin you were rude. What? Were I? I did not mean that huh... It is very difficult to non native speakers to distinguish between what is rude and what is not rude. Slang, phrasal verbs, and so on, are the biggest problems for non native speakers. Someone told me I should learn about those kinds of words because it was the the best way to learn English, particularly rude or curse words, which could help me to know the right way of using English like native speakers. I am still wondering about that. It was definitely true or that person just wanted to fool me. Regarding the entry title, that is only an example from many words I have heard since coming here. It made me really 'pain the ar...' as well :P. I did not understand why that part of body. You know, I can pain in other parts, too. Last week, one of Irish friend said 'si'. Again, what did you mean by 'si'? I asked my friend as usual. He told me that si meant yes. Oh! Maybe I should try to use it next time. I am now waiting for anyone to ask me a yes or no question, so I will answer that 'si'. Interesting!