The classic definition is "red nose, short hose"; i.e., the tendency of Irish men to take to alcohol and to have a smaller than average penis. "Yes, I suffer from the Irish Curse"--uttered by a guest on the Howard Stern show's episode about small penises. I read this from http://www.urbandictionary.com/define.php?term=irish+curse And I thought it was funny and just to share experiences/discuss it. For fun. Let's not get serious because I don't think many believe it.