A hand gesture made by closing into a fist and then extending the thumb and pinky finger. From Hawaii and surf culture, now mainly used when you do BJJ and have lost all ability to pose normally in a photo.
Dude 1: "Team photo!"
Dude 2: *makes a fist*
Dude 1: "Dude, you've been doing BJJ 3 months, you're not in the UFC"
Dude 2: *makes shaka sign*
Dude 1: "SICK SHAKA BRAH!"
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