The intrepid writers and readers of Balloon Juice have collectively channeled their inner Noah Websters to compile the instantly indispensable Balloon Juice lexicon. It is especially helpful in mapping the outer reaches of the Wingnutosphere.
If you are not yet aware of all internet traditions, this is the place to start.
One of my favorites:
Rebunk– to bring back a myth, lie, urban legend or totally discredited idea as though the evidence which reliably debunked the nonsense never existed. Almost always committed by Re-publicans.