Yellow-Blazing happens when a long-distance trail user takes to the road instead of sticking to the trail.
It is catching a ride around some portion of the trail and picking up the hike at a different point on the same trail after letting lots of those yellow stripes flash by at 60 miles per hour.
Doing your own driving around sections of the trail also qualifies as yellow-blazing.
No, yellow-blazing has nothing to do with writing your name in the snow. It's more like hitch-hiking.