It means you don't care about gaining any more knowledge. Apathy has set in. It's at this point that you start to mindlessly conform to everything you see, and something is lost forever. What I do think, though, is that to mindlessly conform to society is wrong. This, I believe, is also extended to the little stuff we do every day.
Lets take wearing ties, for example.
Nobody I know actually likes wearing a tie, but we do it because it looks nice. It's not that I'm against wearing decorative attire, just uncomfortable decorative attire. Clip-ons look the same, so I'm lead to believe that wearing a tie has a reason other than just decoration. I don't get it. If a man went to a party wearing a tux, and everyone else wore casual, the guy in the tux would look and feel silly.