Throw done from behind. You go down on one knee and wedge a shoulder right under their butt and grab both their ankles, then bump them with shoulder and pull their ankles. I've done it a lot from slipping jab/cross but don't think I ever really had a name for it. I think I always called it "body drop" though that's what uke is doing to break the fall, not the throw itself. I need to put it on my technique list for an upcoming test. Thanks guys.