For shame!

for shame

An expression of angry or disappointed condemnation. For shame! You know better than to steal your sister's toys! I can't believe she took advantage of your feelings like that—for shame!
See also: shame
Farlex Dictionary of Idioms.

For shame!

That is shameful! Sue: Did you hear that Tom was in jail? Fred: For shame! What did he do? Sue: Nobody knows. Mary: I've decided not to go to the conference. John: For shame! Who will represent us?
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • for shame
  • shame on (one)
  • shame on you
  • shame on you, him, etc.
  • put (someone or something) to shame
  • put somebody/something to shame
  • put to shame
  • epic fail
  • shame
  • be a crying shame