Like many other whipped stitches, a contrasting thread is ‘whipped’ over the satin stitch.

You need to know the satin stitch to be able to do this stitch.

whipped_satin_stitch          whipped_satin_stitch_2
Fig 1: First, lay the foundation by doing satin stitch. Use a contrasting colored thread to ‘whip’ over the satin stitch. Bring the needle out through A and take it diagonally into B. Then, bring out through C which lies vertically below B, and continue the process of whipping.   Fig 2: After finishing the finished pattern would look like this.