Surf slang for:
1. sitting on the nose of the board while on a wave.
2. resting on the board after a good wave
It refers both to 10 toes dangling and to the perfect score of a judged sporting event, which would definitely be attained by hanging 10.
1) I told you man, hang 10. The board'll do the rest.
2) -Whatcha doin out here? That big one was the last wave.
-Eh, just hangin 10.
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