I'm glad this comes up as a "fresh" topic every now and again. To gain the best understanding of any term/ideal/concept, it's best to go to the original source. In this case, that source is Dr. Woodie Flowers.
http://www.usfirst.org/aboutus/content.aspx?id=36
To me, it's his term, and not ours. Thus, it's up to us to uphold its original intent as best we can and, as Foster pointed out in an old post of mine, it would seem very out of place and even silly to ever be caught saying, "Thing xyz isn't very GP." or using it in any way to judge others.
Study Woodie's definition as published at the FIRST site and think about applying it to your every day life as best you can. In a perfect world, we'd all spend enough personal time with Woodie to understand it best, but I'm not sure his living room is big enough for all of us :-)
Like Jane and others have stated already, also search around here for other related threads. I think you'll find a good deal of insight.