James Hetfield explained the song's meaning to Metallica's fan-club magazine So What
"This is a little different, just the wonder and fear of, again, what's happening to man. Without future tripping too much, just the possibilities of Terminator
,stuff like that, you know. We're wearing smart watches, things are getting closer and closer to just being in us.
"Why would I not have the internet in my head all the time? Why do I have to worry with all these 'emotions' and stuff? Falling in love and getting your heart broken? That doesn't do anybody good. You know, the heart and blood? It's in the way of efficiency! We could be a much more efficient race if we just allow computers to help us.
"And yeah, they are helping us, but how far does that go? All of that craziness. So 'Spit Out the Bone' is that your bones aren't needed. They break!"