A couple of idiomatic alternatives to the answers already given: "My weekend was deadly boring" - similar to 'bored me to death'. "My weekend was dead boring" - 'dead' = 'very'.

"My weekend was boring to death" or "I was bored to death last weekend." Great Job! --> Means you most likely didn't have any fun, or you didn't do anything. There are more possibilitie.

You could also say "This weekend is boring me to death".

No, you could say 'My weekend was extremely dull'.