Well... not over the trees... and not a roller. It's like a pancake. A pancake flips upside down and slides. You don't typically throw it as hard. The shot I'm talking about takes the same flight as a pancake, but you throw it harder and towards the horizon. Since I throw it as a thumber (tomahawk works too) it moves slightly to the left and swings the top of the disc underneath (like a regular overhand). It hits the ground during the end of this part of the flight. When it hits, the bottom of the disc is facing up and to the right slightly. From here, you get one big skip to the right.
The disc never gets over 20' high and takes the same flight as a thumber, but instead of falling down at the end, it skips right. You can play with the flight some to work out some straighter flights, or more extreme skips. Works great for throwing in areas with a very low ceiling.