Hang Ten
What does hang ten mean? Anybody know?
It refers to your ten toes on a surfboard. A surder rides a surfboard
(at near-optimum speed or full stretch) with the toes of both feet
hooked over the front. From the jargon of American surfers since
the early 1960s. The phrase is sometimes used figuratively to mean
something like 'go full-tilt on a risky course'.
Bloomsbury Dictionary of Contemporary Slang, © Tony Thorne 1997