Raise your hand and extend all five fingers.
Bend your middle three fingers into you palm. This will leave your thumb and little (or pinky) finger fully extended.
There are many theories to how and why the shaka was created:
"The 'shaka sign' may have its roots in the Hawaiian custom of holding a lei (a necklace made of flowers) for the purpose of placement over the head on the shoulders of another in an Aloha greeting. The three middle fingers grasp the lei from over the top while the thumb and small finger rest under the lei thus spreading the 'necklace' open."
Some say it was created years ago, by a local field worker. This legendary Hawaiian, from Laie, lost his three middle fingers in a sugar mill accident. From that day on, he used his unique hand sign to share the Aloha Spirit all over the island.
And some believe the shaka started by a group of Hawaiian surfers!