Post edited 10:53AM – Jan-26-12 by Heimhenge
Hi Sylvia, and welcome to the forum!
The phrase "Jumping Jehoshaphat" isn't used much these days. Take a look at this Google Ngram chart of usage patterns in published books:
http://books.google.com/ngrams…..moothing=3
For the etymology of that phrase, from what I've read, it is indeed religious in origin. Couldn't find it on any of my favorite etymology sites, but did find this on AnswerBag:
http://www.answerbag.com/q_view/190396
This would be a good question for Grant, who is the etymology expert around here. He watches these threads, and might just jump in with some more info.