New editions of dictionaries tend to be accompanied by a news handout listing lots of colourful new words that are claimed to have entered the language This gets lots of free publicity. The new Collins seems to have taken the art to the extreme - e.g.
http://news.bbc.co.uk/2/hi/uk news/4074760.stm
A search on Google news for Collins-Dictionary produces many more reports with more of the "new words". It's something to do with our vibrant cuture, apparently. Beyond the obvious ones such as chav and asbo, how many of these words can actually claim to be part of the language now - let alone in six months time? I've never heard of most of them.
Phil C.