Ollie Airwalk
This trick involves the combination of an Ollie with an Airwalk. The rider initiates an Ollie and grabs the board with the front hand. While this is being done the rider kicks the front foot forward (diagonal on the riding direction) and kicks the back foot backwards (diagonal on the riding direction).
Like many others, this trick was invented by Rodney Mullen.
Variations on this trick are: fingerflip, 180 fingerflip, scarewalk (kicking the front foot backward and the back foot forward), etc.
Read more about this topic: Freestyle Skateboarding Tricks