What's the meaning of "blue blood"?

What's the meaning of "blue blood"? What's the meaning of "blue talk"? What's the meaning of "blank and blue"? what 's the meaning of. What's the meaning of '@'? what's the meaning of what's the meaning of the CJ? What's the meaning of the sentence? what's the meaning of "Overnight Rate" what's the meaning of this sentence what's the meaning of "china" what's the meaning of love?