In Search of Worldliness (or at least a definition)

Worldliness is the trump card used against offense that not clearly stated in the Scriptures. Is worldliness spiking your hair or wearing clothes that are in style? Is worldliness catching a decent show at a movie theater or is it using a more modern translation of the Scriptures?

I'm sure there are some helpful definitions of "worldliness" or the "world" around, but I am still searching for them. Sidwell defines worldliness as "an attitude of friendship toward, a desire for, and a wish to be recognized by the world system." What, you ask, is the "world system." Well, the world system is "the unregenerate people of this earth as organize and dominated by Satan." Condensed, worldliness becomes friendship with or the desire to be recognized by unsaved people. This definition is far from satisfactory though. Christ accused of being a friend of sinners in Luke 7:34 (an accusation he never denied) and He loved sinners so much that He died for them.

Here is another definition of worldiness by Driscoll. I think it is much closer in some regards. http://www.youtube.com/watch?v=-NWsGavd0A8

I plan to thoroughly study out the issue myself and post my conclusions here, but until then, what do you think worldliness is? If you have done some study on it, please post your results. Make sure you take the poll since it's National Sensus time!