Settle an argument - is the word 'arse' posh?

Posted by Fabulous_Top4029@reddit | AskUK | View on Reddit | 71 comments

I have always used the word arse, and my friend says ass. To me ass is American (we are both Brits). But he says he can't say arse because it's 'too posh'. I do not believe that the word arse is posh. What's the verdict?