A person who manages to give the impression of being a genuine geek, but, when pressed, can't back it up with the actual technical knowledge. If geekdom is reserved for those who both have the requisite obsessive nature and have used it to amass a world of details which are unexpectedly relevant, then semi-geekdom is for those of us whose obsessive nature never quite manages to come in handy.

Kind of like a Swiss Army knife with only the thing for taking stones out of horses' hooves, but not the blades, or the cool mini-saw. At best, the semi-geek can stretch to being the toothpick :-)