What is this... "Scrub"?

     Recently I've read a small bit of a book titled Playing to Win, in which the author, a game developer named Sirlin, writes about the concept of... well, it's kind of obvious. When "playing to win", victory is the most important goal, and any method used to win is viable and acceptable as long as it still falls within the game's set of rules. While the bits I read focused on the competitive side of gaming, a side that I understand fairly well but am not terribly familiar with, many of the concepts and points stated can be said of non-competitive games or of competitive games played non-competitively. He makes some very interesting and excellent points, and also defines what it means to be a "scrub"... and I match the description.