In general, I don't think it's such a good idea to just dump memory. Most of the time the data is typed, so outputing something more meaningful is better. We haven't had a need for such a macro, so I would suspect it's something very specific -- defining it locally would be better for now IMO.
Not to mention that such a dump might interfere with the terminal. I've had Wine stomp all over my xterms enough by accident thanks :)