I'm not sure the name is proper for what this is... but i think it has the same effect as the /sit /stand /sit /stand macro people use to use.
Step 1.
Window mode world of warcraft
Step 2.
Start running forward
Step 3.RIGHT CLICK the World of Warcraft thing on your taskbar, this will freeze all current activity on the screen. So players will see you still running forward.... even though your actualy not moveing.
Try it for a better example of what it does, jump off a cliff, right click world of warcraft on taskbar and you will stop falling. Of course when you go back to wow un right click, you will continue to fall. Or fake pull mobs in instances to scare your group, like the old /sit /stand macro.
You could use this to wait for your slowfall cooldown to come back so you dont die ;p