Squat, and twist left to hold the dumbbell on the outside of your left leg.
Exhale, and lift the weight diagonally across your body, ending twisted to the right with the dumbbell above your head. Pivot on your left foot as needed.
Control the weight back up to the starting position to complete one rep.
Remember you are moving with force but also control. Don't give into the momentum of swinging the weight around.