Is something that is really, really good. Not just good, but
gooder. Close to goodest, but not quite goodest. Just
gooder. Definitely better than good, so its pretty much in between good and goodest. It is
gooder.
If you're working in a science lab, and your lab colleague does something that is quite extraordinary. Then you
may quip to say then, "my! that was
gooder than good."