very mild swearword used mainly in Uk but also very common (I am told) in Austrailia. Can be used before or in the middle of words/phrases to emphasize meaning - be it good, sarcastic or bad. It really does sound silly when americans say it - think about it, it's the equivalent to a brit saying 'mall' or 'nimrod
' It's just not right. try saying some of these in an american accent for amusment (really no offence look at brit's saying sidewalk and math - equally amusing!).