adjective form of "the Cutting Edge."
When something is "cutting edge" is is at the current limits of scientific/technological/artistic progress. The newest and most advanced.
In 1903, the Wright Brothers used what were then cutting edge techniques, such as a wind tunnel, to design their plane.
This magazine is so cutting edge! It's so much cooler than those conservative, out-of date newspapers.
A guy who doesn't listen to shit music.
"You hear about that guy who shat all over the latest Three Days Grace CD?"
"Yah yo dat boy is dah cutting edge."