F-16 'Elephant Walk' - whatever that is

I apologise for the gap in my knowledge, but it's not a term I've come across before, but the US Air Force describes these Lockheed Martin F-16s as being in "elephant walk" formation (big, grey and cumbersome?). So anwers on a postcard please... Nonetheless, the pic is an interesting one. It shows F-16 Fighting Falcons from the USAF's 8th and 419th Fighter Wings demonstrating the aforementioned "elephant walk" formation as they taxi down a runway during an exercise at Kunsan Air Base, South Korea earlier this month.  

Credit: US Air Force/Staff Sgt. Rasheen Douglas