Me too. That's how I originally learned the acronym, and I quite distinctly remember this term predating the net... by decades.
Again, I'm in agreement. 'Edge' play was a strict reference to cutting. Now it's anything that pushes the 'edge of your envelope' and I think, quite frankly, it was adopted from the concept 'coined' by Wolfe in The Right Stufficey brought up edge play which today seems to mean taking any act to the extreme where injury can be possible or worse. Edge play used to mean knives, swords or anything that could cut.