Skimboarding is a sport similar to surfing which takes place near the shore. The skimboarder stands about twenty feet from the ocean with skimboard in hand and waits for a wave. When they see a wave they run towards it with their skimboard still in hand. Upon reaching the wet sand they drop the board and jump onto it as quickly as possible. Once on the board, the skimmer must remain as stable as possible and prepare to make the transition to the ocean. The skimmer then (hopefully) glides out into the ocean toward the oncoming wave, banks off of it, and rides it back into shore. There are many possibilities for riding the waves and this is where skimboarding gets really interesting.

(Copied from SkimOnline.com)

When you eat dirt for the first time and leave your family to build a shack in the woods

Skimboarding's kinda like trying to skateboard on a quarterpipe that’s coming right at you...A quarterpipe that, if you don’t get there in time, is gonna explode right in your face.

What you tell the really hot out-of-town girls who ask what you're doing with a board on the beach (ignore the others who ask). More commonly called "skimming" by those involved in the sport...