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It actually means all of those things, as well as simply "angry". The root is from the Latin, and refers to the pale, blueish, bruised look of a dead body (hence the term 'lividity'), but to the extent that one make look dead but still be alive, it's usually referring to the pallid or white color. I believe the phrase "you can argue until you're blue in the face" comes from the same idea. In any case, when people start using the phrase not to refer to a specific color but to a specific emotion, then the word no longer means that color. We may call someone who is sad 'blue', and they may even 'sing the blues', but none of those refer to the actual color.
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