Walk-ins

[GeauxHomeLittleD]

I apologize for how I am starting this thread. I know it is poor form to start a thread with poor or little content, but there is a rationale associated with my break from the proper and expected when posting.  

I need to know if you have ever heard the term "walk-in".

It is a term that I have heard, but I have no real knowledge or experience with the phenomena.

Before I share my experience I need to know a little more about them, so I can determine if my experience was valid, or just a thing, not worth any more of my consideration.

I am interested in any information you may have about walk-ins. They don't have to be personal experiences, any knowledge of them will be helpful.

It sounds to me like a more "PC" term for possession, maybe one that makes it sound less harmful and more acceptable to certain kinds of people.