In case you've not heard of it, there's a great place to find out the meaning of the newest words or phrases being used, called Urban Dictionary. Fellow users frequently update the Urban Dictionary with new words and definitions, including yours truly. So far, I have added 6 words that have been accepted, 5 of which have been met with significant thumbs up peer approval.
I'm also a frequent user of Dictionary.com too, which has recently improved its site content.
Oh, and also, on many online searches I do nowadays, I follow up the search text with "wiki" to make sure wikipedia entries show up, as these are often more concise and useful than traditional news or database sources.