v. Slang 1. To burst off with a short, sharp, explosive sound: If the pressure in the bottle gets too high, the top will pop off.
2. To leave abruptly or hurriedly: She popped off a few minutes ago, but I don't know where she went. He popped off to the store.
3. To speak thoughtlessly in a burst of released anger: The movie star popped off at the reporters who were hounding him.
4. To die suddenly: The book is about a rich man who pops off and leaves his family millions of dollars.
5. To kill someone: The gangster popped off the witness outside of the courtroom. She learned that he was a double agent, and so she popped him off the next time she saw him.