Watch the Owl Roll online guitar lesson by Freekbass from 50 Freekbass Licks You MUST Know
This is kind of a slower triplet roll creating a dirty kind of sound. I am letting each note of the triplet ring a bit to make the sound more brooding. I start by thumping an open A, hammering up to a third fret C. Then pluck an open D and let it ring a bit.
I finish with a low G on one bookend, and a hammer-plucking fill on the other. Another good one to start a practice session with to get your hands loosened up a bit.