Shadetree Mechanic: Walter was correct but I would like to embellish. Shadetree mechanic was a term most used until the mid 70s. Before the days when men were consumed by video games and before electronic gadgets took up residence under the hood of our car. In those days, most men owened a set of wrenches along with other toolbox goodies and would gladly spend an afternoon with a buddy doing a tuneup in the driveway, under the shade of the nearest tree. Required tools and parts were as follows: sockets with spark plug socket, timing light, open or box ends, screwdriver and maybe a hex key, gap, oil filter wrench, (hammer), new plugs, points, wires, fuel filter, oil filter, condenser, air filter and a six pack of beer. By the time the beer is gone, the tuneup should be complete. Of course, several other task could be completed on the vehicle by men of this day, but tuneups were the most fun. Shadetree is a lost term today because it doesn't turn up in video games where things get blown up.
Definitions include: Usually describes a professional mechanic that works on cars , bikes and other vehicle for a way lower price than a shop BUT there's NO warranty or guarantee on parts and labor. Compare to: Shadetree Mechanic, Personal do it yourself Mechanic.