Bloody - seemingly harmless word common place in the U.K. When broken down, it becomes By(the virgin)mary. Also in the form bleedin, and more commonly bloody hell.
British English equivalent to the American English swear word 'fucking'. It must be noted, however, that in Britain and Australia 'bloody' is considered to be much less offensive than 'fucking' is in America.
According to the Oxford English Dictionary, its origins lie in a reference to the aristocratic rowdies of the Restoration (i.e., those of noble or aristocratic blood).
A term used by some of the more morally questionable young men in the U.S. to describe a girl that they have been sleeping with but not dating. Can be used as a much more offensive version of "Tail", "Piece of Ass", "Ho", Etc.