Holden Caulfield's favorite insult, an old way of saying poser
"What I have to do, I have to catch everybody if they start to go over the cliff- I mean if they're running and they don't look where they're going I have to come out from somewhere and catch them. That's all I'd do all day. I'd just be the catcher in the rye and all. I know it's crazy, but that's the only thing I'd really like to be. I know it's crazy."
Here he expresses how he'd like to stop people from beocming phony as they grow up.