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what is the meaning of Out of the blue? I just heard a conversation like below;

Jesus. Out of the blue, man. What brought that up?

what are the other possible cases that this phrase might be used?

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It means "coming on you without warning" as if falling from the sky directly onto your head. "The blue" in this case is the blue of the sky.

EDIT

out of the blue happening suddenly and unexpectedly Then one day, completely out of the blue, I had a letter from her. : The attack came out of a clear blue sky.

This is probably derived from the old idiom "a bolt from the blue":

bolt from the blue Fig. a sudden surprise. (Alludes to a stroke of lightning from a cloudless sky.) Joe's return to Springfield was a bolt from the blue. | The news that Mr. and Mrs. King were getting a divorce struck all their friends as a bolt from the blue.

I have heard this did not originally refer to lightning, but to crossbow bolts in medieval times raining down after having been shot vertically. I'm not close to my reference materials at the moment, however, so I will look later.

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    I may be wrong here, but I feel the phrase has a strong association with "unexpectedly" that, for example, "just like that!" might not have. If you used it in a context where it was just your own personal lack of attention that caused you to be caught you on the hop, it kinda invites the response "Well, you could have seen that one coming!" Commented Jun 6, 2011 at 16:14
  • +1; This is how I have always taken this phrase. One source claims 1837 as the origin.
    – MrHen
    Commented Jun 6, 2011 at 16:16
  • I like the explanation (would have been roughly my guess too), but do you have any back-up for this?
    – T.E.D.
    Commented Jun 6, 2011 at 17:33
  • @T.E.D.: Adding a link for you.
    – Robusto
    Commented Jun 6, 2011 at 18:09

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