(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 very wet
Because of forgetting bringing an umbrella, I look like a drowned rat when it rains.