There is a world out there and around us and then there is what we make of it. Words help navigate through the world by means of letting us name objects/events and in doing so face them. Experiencing something and being able to say "this is [insert word]" is like dropping an anchor, like tying yourself to the world, like building a bridge. People often don't agree on what a word means : what's funny for one person might not be funny for somebody else. The mismatch, albeit confusing at times, also helps us make sense of the world -- helps notice differences , similarities, all sorts of interesting effects.
I like the idea of this secondary personal world that has the features of the actual world, yet different from it and unique. It's singularity arising not only from the unique combination of events/places one has encountered but also from the words that this person chooses to refer to them (= from the way he/she relates to those events).
This quote from The Joke by Milan Kundera led me to thinking that the personal world of words is not the only secondary world possible:
"Once more I was amazed by the incredible human capacity for transforming reality into a likeness of desires or ideas".