You mean tomoe nage? Like this
If that's the throw u mean the reason probably is that is easy to reverse. And if it goes wrong the other guy is on top of you. And it's really hard wityhout the gi due to sweat
Aye thats the one...awesome eh. This seemed to come out of nowhere at UFC 13. I think it would only work now with the surprise factor...the other guy would have to think you are pulling guard of something.