A family name of some tall, strong, yet fit (sometime skinny)
Example:
He is name is Bob Rawbone, a decent gentleman from U.K.
A bone that is not cooked yet is often used to describe something very thin.
After the surgery, he lost his appetite and as a result, he lost a lot of weight. Poor man, he is as skinny as a raw bone.
For Bob, Mr. Gordon succeeded in capturing a big, rawboned white horse with a gift of astonishing speed.
adjective
having little flesh, especially on a large-boned frame; gaunt.
adjective
slim down to be more fit
Example:
Wow, Jon lost about 80 lbs.
He is raw boning, which is good for his health