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general::
Phrase(s): (Do) you mean to say something? [and] (Do) you mean to tell me something?
Do you really mean to say what you said? (A way of giving someone an opportunity to alter a comment. The something represents a quote or a paraphrase.) • Mary: I’m leaving tomorrow. Sally: Do you mean to say you’re leaving school for good? Mary: Yes. • Bob: Do you mean to tell me that this is all you’ve accomplished in two weeks? Bill: I guess so. Bob: I expected more.
McGrawhill's American Idioms And Phrasal Verbs