Ha, I'm new to this so didn't know what the acronym meant, although I thought I had a rough idea. I googled it and came up with a very old thread from this forum. I got a good laugh, and I needed it today!
Of course it split of to another thread and I've never heard of a Fred before. Different definitions for that one but I don't fit any of those.
I think my prefered riding area is considered a MUP but I'm still not sure. Maybe the link will work. Is this a MUP?