Watch the Memphis Moves online guitar lesson by TrueFire from Rhythm Guitar Greatest Hits Vol. 2
Lesson Source: Shane Theriot's Rhythm Mojo
The main point of this lesson is that sometimes it's just in the right hand (or strumming hand). Note how I'm just using standard bar chords, nothing fancy here. The chunk on the bottom strings is the meat of the whole riff. Note the use of the 6th chord, this is a nice sub for a dominant 7th chord sometimes. The hammer-ons are classic and should be a point of study on their own. I also slide into the chords on the approach which makes it bounce a little more.