To me, it means going out for a glass of wine, shooting the breeze, enjoying a movie....but without the expectation that a relationship will ensue.
It means not being exclusive to the other person, and vice versa.
Of course, it is possible that after a few casual dates, something could happen to take it to another level, but to me it still means just enjoying the company of a woman in a social situation.
I am getting a little tired of just going out with my buddies!