Cunt

There are a number of different ways in which this word can be used, besides being an informal name for female genitalia*, it can be used in at least two other ways: 1) A derogatory name for a person you intensely dislike; 2) As an acronym standing variously for Computer User Non-Technical, Cannot Understand New Technology, Cannot Utilise Normal Thinking. No doubt there are others as well, but those mentioned here all share a common theme in that the person described is a bit of a twat. *For some reason this is now perceived to be offensive, but during the Middle Ages in Britain it was a word in common use indeed, it still remains in some street names e.g. Gropecunt Lane.