How to Ollie
Definition: A skateboarding trick where the skateboarder pops the skateboard into the air. The effect is the skateboarder jumping with the skateboard stuck to his or her feet.
Basically, the trick involves snapping the tail of the skateboard down while sliding the front foot up along the skateboard and jumping. This trick takes a lot of practice to get the technique, but once learned it opens the door for the bulk of common skateboarding tricks.
Click here for a great skateboard video: