A front mobe is front roll with an off-axis handle-pass, letting go with your back hand and then passing from your front hand to your back. Effectively a front mobe is a handle-pass half way through an S-bend rotation
If you're ready for more detailed lessons, you can buy Progression Pro in the Kiteworld Shop - www.kiteworldmag.com/shop/
To see moves broken down check the Motor Drive section in Kiteworld Magazine or on Kiteworldmag.com here...