What does "Sharp Shoulder Turn" mean?

I have now heard this term "sharp shoulder turn" several times. The latest time from rbaum's post. Sounds important...

Can somebody explain this?

Thanks,

I would imagine - the feeling of turning the right shoulder to the plane while maintaining a stationary head.

As sharp as you can and knowing its right by using your right shoulder as your guide.
It almost feels like a reverse pivot, but in feel only.............

that's very interesting, I have been thinking about this for the last couple of weeks, because I'm obviously not doing it properly. I thought that because I wasn't doing it sharp enough, my longer clubs were way too low in trajectory.

Thanks for the information!