As used in the Hawaiian Islands, "Hang Loose or "Shocka" is used as a non verbal expression; or greeting. To tell the receipiant, that every thing will be OK, Relax, Stop looking at me w/ that stern look on your face.
( Mostly Visual) With the three mid figures folded down. Extend the Thumb & Pinky finger out, and shake vigurously, about the radial axis of the wrist. If needed, Exclaim verbally "Check Ya' Later Dudes" as in the Movie's "Fast Times at Ridgemont High" or "The Exellent Adventures of Bill & Ted" Hang Loose & Mahalo, Aloha <)|||/