cloudswinger
Contributor
I'm not positive on this one, but, I think this poster may have been referring to the urban slang definition of turtling or turtle head. As opposed to the nautical definition that was being used in this thread.
Well, for surfers, turning turtle is when you wrap the board with your feet and flip underwater so the breaking wave goes over the bottom side of the board, and then you quickly turn back up and paddle like crazy again. It's for when your board is too big to duck dive.
It seems that in diving, the negative bouyancy of the gear can cause you to end up facing the sky?
I've heard the turtle head term a lot in the theatre/circus world, especially when guys are wearing tights.