Definition: Redriver is a slang term for a person who takes over or monopolizes a position or job, often with malicious intentions. It's like when your parents get mad at you for not getting a promotion, but they're secretly happy their son was appointed to be your boss instead. Fun fact: The word originated from the Dutch word "red" and "river," which means 'blood'. So, in other words, it's about someone who has taken over or monopolized control of something important.