A term for someone who only does one thing all day, every day, and excessively. Can sometimes be considered a "robot" to what they do, and they take very little time on important things in life. (family, excercize, etc.) Is motivated to be #1 in what they do.
Person A: I can't go to work today, have to become the number one log runner in the world.
Person B: You're such a Zezima! *cries*