1. To start being productive in one's own life; to act independently and responsibly. You can't just live in Mom and Dad's basement playing video games forever—you need to go out and get a life. After waking up with another raging hangover, I knew I needed to grow up and start getting a life.

2. To do things one finds enjoyable and fulfilling. College isn't just about studying and getting good grades. You need to get a life—go to parties, meet new people, join a sports club, anything!

3. A rude imperative telling one to mind their own business or stop focusing on unimportant or immature things. Oh, get a life, Ricky. You're the only one who always has to interpret an innocent expression in some disgusting way. These politicians need to get a life and stop interfering in our private home lives.