Ex-the-fucking-scuse-me?

The result of when someone tells you something highly unbelievable, or just plain surprising. It can also be used elsewhere, such as when you're dissed. Basically a vulgar form of excuse me.

(while watching South Park on tv)

Ms. Garrison - "So there you go! You're the retarded offspring of five monkeys having butt sex with a fish-squirrel! Congratulations!”
Me - Ex-the-fucking-scuse-me?