What a story
An inappropriately enthusiastic response used to belittle an incredibly banal or boring statement. Copied from a line of dialogue in Tommy Wiseau's "The Room".
Example:
Ceri: Organic revision is hell. I have no idea what I'm looking at!
Tom: Ha ha ha. What a story.
Ceri: Organic revision is hell. I have no idea what I'm looking at!
Tom: Ha ha ha. What a story.