It is a broad and general term because that is how I would generally see it. In a way, I see what lies between what is me and what isn't me comes with this filter. It is like distilled water and salt water. Distilled water may be clean, but salt water fish need salt water to survive.
Most of the time, I filter what I say, do, or think. Those times when I don't filter:
I can play a game without feeling like I am wasting time
I can say something without feeling like I'll get a response that doesn't help.
I can listen to music without worrying.
I can look at the stars and be in awe.
I can get into my hobbies without worrying about others.
I can write a journal entry when I feel like it and write about everyone and everything.
I can interact with people without feeling like I need to think of what I say to the person - the conversation just goes in the direction it goes and I wouldn't feel like I need to filter what I say.