I don't believe this

I don't believe this

An expression of surprise or incredulity, possibly bordering on vexation. I don't believe this—I have the winning lottery ticket! So you came crawling back to us after all. I don't believe this.
See also: believe, this
Farlex Dictionary of Idioms.

I don't believe this!

Inf. What is happening right now is unbelievable! It's snowing in July! I don't believe this! I don't believe this! It can't be happening.
See also: believe
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

I don’t believe this!

exclam. What is happening right now is unbelievable! I don’t believe this! It can’t be happening.
See also: believe
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • I don’t believe this!
  • I don't believe it
  • I don't believe it!
  • I don't believe this!
  • get out of here
  • Get out of here!
  • get outta here
  • well, well, (well)
  • my word!
  • upon my word