(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.
Used to allude that the last force, problem or burden which is seemingly minor and small causes a person, system or organisation to collapse or fail
Her husband's violent act last night was the straw that broke the donkey's back and she left him