I'd be damned - A very angry and surprised exclamation when something happen

A very angry and surprised exclamation when something happens that should not happen.

I got a D on my math test. I'd be damned if I didn't swear.

My mom said I had to clean my room. I'd be damned if I didn't yell.

I saw my dog wearing a hat. I'd be damned if I didn't laugh.