:US interpretation from lots of UK friends  Bloody used to be very vulgar (fucking) but just like fuck has become common to hear.  Many people use the word "Welch" on a bet but not as many know that it means Welsh, but I would certainly not be surprised to hear a Welshmen get into a fight over it. Similar to Indian giver or better yet Gyp or Jew down (which I can't believe has survived as a redirect in this context!) I would think. Paddy wagon is not generally offensive, as its just as likely Paddy was driving the wagon (Long tradition of Irish policemen) (but it does sound very archaic)