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.

Tells the recipient there are people in the sender's room who may be able to see the computer screen, so be careful what you type!