I don't believe this!

I don't believe this

An expression of surprise and/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

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