Well, you know how I mentioned out of the blue has a negative form?
Well, ladies and gentlemen, boys and girls, this is it.
Meaning and EtymologyEdit
It means, basically, a nasty surprise. The 'bolt' refers to an arrow that you didn't see coming ... and having an arrow fired at you ain't nice.
After receiving a nasty shock.
"Whoa. I had no idea that things were so bad between you and Cam that you were divorcing: that's a real bolt from the blue."