Who said jumping jehosephat?

The phrase "Jumping Jehoshaphat" is an exclamation of surprise or astonishment. It's likely a variation of "Jumping Jupiter," a similar phrase that dates back to the 16th century.

It's difficult to say who first used the phrase "Jumping Jehoshaphat," as it's a common expression with no known definitive origin.

However, you can find the phrase used in various works of literature and popular culture, suggesting its widespread use and acceptance.