Ura Nage video
Info about "Ura Nage video"
Ura Nage (reverse throw), is one of the original 40 throws of Judo as developed by Jigoro Kano. It belongs to the fifth group, Gokyo, of the traditional throwing list, Gokyo (no waza), of Kodokan Judo. It is also part of the current 67 Throws of Kodokan Judo. It is classified as a back sacrifice technique, Ma sutemi. 
Ura nage is a huge throw. Simply, stepping to the side, tori places one hand on the stomach of uke, one hand on the back. Lifting into the air, tori starts to throw themselves as they literally launch uke into the air and to the back of tori. 
From Wikipdia  and Akitas Judo