I think I saw it translated somewhere along the lines as "throw away practice". Searching for "stugekio" returned no results at judoinfo.com. Searching for "throw away practice" yielded some results.
http://www.judoinfo.com/kudo.htm
Kudo (9th dan) spells it sutekeiko.
http://judoforum.com/lofiversion/index.php/t17637.html
Sutegeiko = Throwing practice where the superior player allows the student to make throws without resistance and briefly corrects mistakes or offers constructive advice for improved technique.
Yakusokugeiko = Training method where Uke offers no resistance to Tori.
Seems to be their definitions and ours don't exactly match up, as sutegeiko above specifically states it is a non-resistive practice.
Traditionally, we have approached stugeiko (and I'll call it that until we figure this out) as practice where we apply resistance. For example, I pick a throw I want to work on such as osoto-gari. Your task is to prevent me from doing osoto-gari, but to be skillful about it. The "iron bars" approach of blocking with the arms of steel, leaning forward with your butt sticking out isn't what we want because it is very unskillful and you don't learn a lot. You want to make my job more difficult by skillfully moving, staying centered, weight on balls of feet, knees slightly bent.... all those principles.
I'll bet the dojo desk reference Nick has would clear the issue up.