PIR
PIR has 2 meanings
This page explains what the acronym "PIR" means. The various definitions, examples, and related terms listed above have been written and compiled by the Slang.net team.
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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.