A Sumo Squat is similiar to a basic squat but rather than placing your feet hip-shoulder width apart, you spread your feet wider than shoulder width apart and rotate your toes out (similar to what a sumo wrestler does). Take a look at the link below.
Hope this helps!
Love Sumo Squats! I added a link to a few photos on the Sumo Squat..some other names are: Duck Squat.
Also: Here is a link to the IDEA Fit Tips with “Sumo” Squats in the program.
I Hope This Helps!
This is essentially similar to a regular squat with the exception of your foot position and width of your starting stance. With feet wider than a normal squat (perhaps about shoulder width or a bit wider) and with the toes pointing outward at about 45 degrees, you then perform a squat. Any doubt as to how this looks, take a look at the starting position of sumo wrestlers about to begin a match.