that refers to dumbass or stupid (ofcourse, not literally). and he used that term to call naruto in part 1. feel free to watch some footages in utube if u want to see if part1 sasuke really said usuratonkachi
That, indeed. Sasuke is no longer in darkness nor full of hatred. I also like how much he trusts kakashi, that he has no issues with giving his left eye to him if something were to happen. That was a nice nod to obito and kakashi right there, and also how team7 sasuke is.