Parent In Room
Online jargon, also known as text message shorthand, used primarily in texting, online chat, instant messaging, email, blogs, and newsgroup postings, these types of abbreviations are also referred to as chat acronyms.
It is most commonly seen on IM when a teenager wants to alert the other person that a parent is nearby. For example, "h/o - PIR..."
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NetLingo Classification: Acronyms and Text Message
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