Why Mccoy Called Bones?

"Bones" was a nickname for Doctor Leonard McCoy in multiple realities. The use of "Bones" originates with the term "sawbones" in 19th century American medicine where military doctors, especially surgeons, were called "sawbones" because of all the amputations they had to perform during the Civil War.

Why did Captain Kirk Call the Doctor Bones?

In the 19th century, Civil War surgeons were often referred to as "Sawbones" because of the many battlefield amputations they would carry out. Captain Kirk truncates this phrase to "Bones" for his chief medical officer - an ironic sleight given the technology and expertise available on the Enterprise.

Did McCoy ever say Dammit Jim?

But whatever, the main thing to note is that they couldn't say "damn" on Star Trek, so McCoy never says "Damn it, Jim" on the show. He eventually says "Damn it, Jim" in the second Star Trek MOVIE, but not in the context of "Damn it, Jim, I'm a doctor" line.