Any video game controller that isn't a part of that system's brand controllers. If someone owns 4 controllers for a video game system, statistics show that at least one of these controllers is a Mad Catz, because they're much cheaper than the actual brand controllers. All Mad Catz for every generation of controller includes a turbo button, which royally fucks you over if you ever touch it.
NOTE: Despite the company that the "makeshift" controller comes from, it is still referred to as a Mad Catz controller.