Yup, that would be a workable definition.
I think if someone described a person using that term, I would envision a person likely to fly off unpredictably in unexpected directions - usually in a way that is a danger to others and him/herself. Not grooving to the same groove as the rest of us.

I once had to define "bonehead", and was able to come up with someone who is basically quite smart, but who's intelligent thoughts have trouble squeezing out past the thick skull. :)