A "full squat" refers to a position where you bend your knees deeply and sit down with your hips close to the ground while keeping your feet flat on the floor. Full definition
I stand on the bands and go to a deep, full squat position. (ageless-athletes.com)
The hamstring and calves assist in the lower body and if you have done full squats, where the thighs break the parallel position you probably felt your hamstrings the following day. (christianbosse.com)
The last breath is taken before descending from half into full squat so that the ribs are again locked into a strong position to support weight and maintain pressure. (arrowptseattle.com)