RU/18 Meaning in Chat or Text Messages Online

RU/18 is an internet slang used to ask someone if they are over 18 years old. It is often used in online forums or chat rooms where age restrictions may apply. The acronym stands for "Are You Over 18?" and is a quick and easy way to confirm someone's age without having to ask for their birthdate.

Example:
Person 1: Hey, can you help me sign up for this website?
Person 2: Sure, but before we start, RU/18?
Person 1: Yes, I'm over 18.
Person 2: Great, let's get started then.