According to a couple sources on the internet (none I would claim to be authoritative), the phrase "make no bones about it" originated as a 15th-Century English phrase referring to the lack of bones in one's soup. These sources reference the Oxford English Dictionary as stating that soup with no bones was easy to swallow. Somehow that evolved into the no nonsense meaning of the phrase we have today. Someday when I have enough money to buy the unabridged OED, I shall look this up myself. Until then, I shall ponder the phrase whenever I encounter a random bone in the wild, like this deer shoulder bone I photographed today.