you'll be sorry you asked

you'll be sorry you asked

The question you're asking has a very boring or unpleasant answer, so you might not want to hear it. A: "So, how exactly does this fancy new machine work?" B: "Hoo-boy, you'll be sorry you asked. It's all quite technical." A: "What brought you all the way out to this part of Arizona?" B: "You'll be sorry you asked." A: "Try me." B: "Well, my abusive ex-boyfriend ran off with all of my savings and I got evicted from my apartment in Reno. My aunt lives here and is letting me stay with her while I get back on my feet."
See also: ask, sorry
Farlex Dictionary of Idioms.

You'll be sorry you asked.

Inf. The answer to the question you just asked is so bad that you will be sorry you asked it. (Compare this with (Are you) sorry you asked?) Father: What are your grades going to be like this semester? Sally: You'll be sorry you asked. Mary: How much did you pay for that lamp? Jane: You'll be sorry you asked.
See also: ask, sorry
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • come to a bad end
  • come to a bad/sticky end
  • Let every man skin his own skunk.
  • have no stomach for (something)
  • in for
  • be in for
  • be in for something
  • have an accident
  • horse and rabbit stew
  • learn (something) the hard way