(well) I'll be damned! impolite old-fashioned sentence spoken language informal
Well I'll be damned! Our team lost.
I'll be damned if I let you borrow my books!
To be surprised by some sudden occurrence
To greatly surprise, shock, or confuse someone
An exclamation of shock or surprise
This phrase was very popular in the US South. It's not used very much today.
To be outperformed or outrun by someone, usually by a very wide margin.
You have to be quicker to finish this task or you will eat other my dust.