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What is I don't know what to say?
Often used when someone says something that is obviously a wrong/mistake/undependable, and the person who is listening can't say anything to defend his actions.
Jack: I missed the deadline for applying to NYU, because I read the email wrong.
Sam: They gave us a one week extension for that exact reason? Why didn't you submit it.
Jack: I was just so lazy about it.
Sam: I don't know what to say Jack, I guess that's a lesson learned.