Something is robotic if it moves or behaves like a machine. If you express no emotion and do things in an automatic-seeming way, your friends might say you're robotic.
The adjective robotic can describe something related to the use of robots, like a robotic technique for dismantling a bomb or a robotic tool for surgery. Often, it's used to describe a person who reminds you of a robot: "She gets good grades, but she's so robotic! All she does is work — never has any fun!" Science fiction writer Isaac Asimov is credited with the first use of robotic in 1941.