What does it mean to be a scatterbrain?

In my experience it means having several actions in the brain at the same time and trying to act on them simultaneously. I am putting dishes in the dishwasher and cleaning the counters and microwaving my breakfast and feeding the dog, and getting ready to take my DIL to work, and putting the soiled dishtowel in the laundry and getting the clean one out and throwing away the wrappers from last nights meals, all at once.

It just means ditzy or unfocused.

Yes, unfocused.
Talking with someone that is scatterbrained is like having 5 conversations at once with the same person, usually none with any depth.

From Merriam-Webster’s Collegiate Dictionary, 11th. ed. – ” a giddy heedless person.”

It means that one should sharpen the focus of their laser.

It is someone with a shotgun during a zombie outbreak.

@Brian1946 Or maybe their laser works fine, but they don’t remember where they put it. ;)

@YARNLADY if you are getting all those things done then that is far from scatterbrained, you are multi-tasking, well done! Could call it ‘hectic’.

I think an example of scatterbrained is having that many things in mind and not getting any of them done because attention isn’t on any one of them enough to accomplish anything.

Scatterbrained doesn’t have to involve a lot going on, though, but does mean attention can’t get fixed on an idea long enough to accomplish anything. Someone daydreaming might not be paying enough attention to what’s going on in front of them.