You mean to tell me

(Do) you mean to tell me (that) (something is the case)?

Used to elaborate upon something bad that someone else has said and that one finds hard to believe. A: "We'll need another cash infusion before we're able to resume work on the project." B: "Hold on, you mean to tell me that you've already spent the money we gave you? How is that possible?" Do you mean to tell me we're stuck out here in the wilderness with no food, no water, and no way of contacting the outside world?
See also: mean, tell
Farlex Dictionary of Idioms.

You mean to tell me something

? Go to (Do) you mean to say something?
See also: mean, tell
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • (Do) you mean to say (that) (something is the case)?
  • (Do) you mean to tell me (that) (something is the case)?
  • a nod is as good as a wink
  • a nod's as good as a wink
  • give (someone) the royal treatment
  • nod is as good as a wink to a blind horse
  • a nod is as good as a wink to a blind horse
  • a nod is as good as a wink to a blind man
  • production
  • make a production of something