PIR

PIR is an acronym that stands for "parent in room," which is used to warn a person that a parent is nearby. It is typically used by teenagers who are hiding something from parents.

PIR is often seen in texts, messages online, and snapchats as a sly warning. If you're a parent and you see this acronym you should know that your kid is up to something but try not to freak out and turn your house into Guantanamo Bay.

If someone you're chatting with sends you PIR, it means there are other people in the room with them. Those people might be able to read your conversation, so you should be careful about what you send.

If you have something confidential (or otherwise inappropriate) that you want to discuss, ask the person you're chatting with to give you a heads-up when those in the room with them leave. Or, save that topic for your next conversation, when there hopefully won't be others around.