The Moeller Stroke allows you to get multiple bounces from a single arm motion using a whip-like technique. Mastering the Moeller technique allows a drummer to be more relaxed and obtain more efficiency from each motion. You can play faster and have much more control and precision over where you place accents.
Check out this Moeller Stroke video lesson by master drummer and educator Jim Chapin!
Here is another video tutorial about Moeller Stroke technique by Dave Weckl.