you're telling me
I know. A: "Training for a marathon is so grueling." B: "You're telling me—I've already run three of them!"
You're telling me!
Inf. I know all too well the truth of what you are saying. Tom: Man, it's hot today! Bob: You're telling me! Jane: This food is really terrible. Sally: Wow! You're telling me!
you're telling me!
used to emphasize that you are already well aware of something or in complete agreement with a statement. informalyou’re telling ˈme!
(spoken, informal) used for saying that you already know and completely agree with what somebody has just said: ‘Cooking for ten people is hard work.’ ‘You’re telling me!’