Originally Posted by Bear

It's a term doctors use to describe children who would rather be outside playing than sitting in classrooms learning, so they can medicate them to within an inch of their lives.

Also used by adults who want to find an excuse for the fact that they can't be bothered to stay in one job long enough to get anywhere, who may have flitted from one job to another with annoying frequency and who crap out when things get tough.

Why do you ask?