Does DO mean Doctor of The Bones?

No, DO means Doctor of Osteopathic Medicine which is a type of full-fledged physician like a Doctor of Medicine (M.D.) Just like M.D.s though, a Doctor of Osteopathic Medicine could complete medical school and decide to specialize in orthopedic surgery if they wish.

There are other meanings of DO such as:dissolved oxygen, dynamic optimization, digital output, data only, and more. Most probably, you are referring to the first term, which speaks of the science of skeletons and muscles.

As pointed out by a fellow answerer, "DOs can prescribe all medications and perform surgeries like MDs (as per specialty), but they also look around the body inspecting the bones and bony landmarks and palpate the bones of the patients."