lean, mean (something) machine

lean, mean (something) machine

Someone or something who is prepared and able to work very hard, skillfully, and efficiently to do something. A humorous play on the phrase "lean, mean fighting machine." After 15 years of experience in this industry, our little firm has become a lean, mean bean-counting machine. This little barbecue might not look like much, but it's a lean, mean grilling machine!
See also: machine, mean