What (who) is twinkerer - definition

A twinkerer is an incompetent, or self-proclaimed parageek (See entry for parageek.) The typical twinkerer has a can-do attitude about fixing things (especially computers around the office). Sadly, the twinkerer has a horrible ratio of successful-to-unsuccesful attempts to fix problems on which s/he is typically consulted.
The office twinkerer fixes computers in a manner similar to that in which many people try to save time and money by fixing their own cars, only to end up making matters worse than before they began their...good faith effort.
Walter represented himself as a parageek, but he was really just a twinkerer. Now my computer's even MORE broken than it was before.