says you

says you

That's only your opinion (and you're wrong)! Used to express disagreement with or defiance against some general statement someone has just said. A: "There's no way we'll be able to sell all of these chocolate bars." B: "Says you! I'm already about halfway through my stock." A: "No one is going to want to buy something like that." B: "Says you—I think it looks pretty interesting!"
See also: say
Farlex Dictionary of Idioms.

Says you!

Inf. That's just what you say!; You don't know what you are talking about! Fred: You are fat and ugly. Tom: Says you! Mary: People who go around correcting other people were found to be very annoying in a recent survey. Bill: Says you!
See also: Say
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

Says you!

exclam. That’s just what you say!; You don’t know what you are talking about! FRED: You are fat and ugly. TOM: Says you! MARY: People who go around correcting other people were found to be very annoying in a recent survey. BILL: Says you!
See also: Say
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • Says you!
  • sez
  • says who
  • Says who?
  • sez who
  • Sez who?
  • against
  • against (someone or something)
  • a difference of opinion
  • in defiance
References in periodicals archive
There is a school of thought that says you should go drinking with the boys.
Gifted says you have something the rest of us don't have, so why do we need to do anything for you?"
Richard Clapp, associate professor in the department of environmental health at the Boston University Schools of Public Health, says you may soon need to fear household products you have most contact with: "If you're sitting on it, or if it's part of your desk, or in the frame of your bed-where you have constant exposure and for several hours," you will be in most danger.
But he says you "really have to understand physics" to explain it.