You have a good knowledge of the how people act in the whole world, rather than just a small knowledge of how people act in your local area. You are familiar with different customs in many other parts of the world besides your own. Also, you are not naive and have experienced (or at least know) different situations, even in your own country and area.

To add on to fdmaxey, Worldy also means devoted to, directed toward, or connected with the affairs, interests, or pleasures of this world. A worldy person is also a materialistic person in this sense of the word. e.g. The ascetic was always lost in prayers. His brother however, was always lost in worldly pleasures !!