1: I think I do, but it's been a lot of years--I learned the term in the 1970's from brothers who were into wilderness hiking. I'll google after I post to be sure I'm right.

2: Nope. I had forgotten the word existed for the past, uh, 30 years or so.

3: I lived near Kalamazoo in southwestern Michigan when I heard the term, but I suspect it is irrelevant. I strongly suspect the word got there via nationally published hiking books and magazines. Its introduction to me had the feel of specialized hobby jargon that somoene had just picked up.