MEME REFERENCE

Dafuq did I just read

Use after reading something so incoherent, bizarre, offensive, or mentally taxing that ordinary confusion is insufficient.

What it expresses: Written material provokes stunned disbelief about what the reader has just encountered.
Example: A friend forwards a paragraph whose argument contradicts itself in every sentence, and you respond with this reaction.
When not to use it: The document is clear but you disagree with its conclusion; disagreement alone is not bewilderment at the text itself.