It's a MAC in a Robo.
So, what are those?
MAC - Mobile Artificial Consciousness. Any self-motivating machine intelligence designed to operate some kind of body that allows it mobility. Of course, MACs are able to move, but like mobile homes, don't always do so.
Robo - Shorthand for RObot BOdy. Humans and MACs alike can pilot Robos, but MACs do a much better job and dominate the scene...resulting the name of the game.
A RoboMAC is the integration of a Mind and a Body.
This game is for all the fans of giant robot cartoons, live action shows, and manga who want to roleplay those kind of characters, but have found other systems too wargame-like. RoboMACs tries to have more of a dramatic, cinematic flavor to it, replacing hard numbers with general traits and 'hooks.' The rules are tilted more towards combat between humanoid or animalform Robos as opposed to vehicles, since that captures more of the feel of the genre.
The rules are useable for any kind of giant robot game, with an attempt to cover as much ground as possible in the mechanics and to allow for as many different campaigns as there are gamers.