Answer:
Don't that beat all?
It's an old (very old) expression which denotes something unusually outrageous, going above and beyond the ordinary-- surpasses everything. As in my earlier response, usually it means, "don't that beat all?!
We always thought this expression came from the practice of hunters of antelope in the intermountain west. You'd tie a rag on a bush (sagebrush) and when the antelope came along, their curiosity would make them go up to the rag to see what it was all about thereby making it easy to bag your antelope. So, to me, "If that don't take the rag off the bush" is an expression of amazement at something well-accomplished, sort of saying "Hot darn" or "That really does it!"