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.
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