PM
1. What does PM stand for?
Private message
Example
"I can send you a PM with more information if you would like."

Online, PM typically means "private message"
Related Slang
Usage
Last Updated: January 31, 2022
2. What is pm short for?
Postmeridian
Refers to the hours between noon and midnight, i.e. 5:30 in the evening.
Example
"Just so you know, the show starts at 6:00 PM."
Related Slang
Usage
Last Updated: December 21, 2012
When someone plans to PM you, it means they're going to send you a "private message." Forum and social media users use this acronym when they intend to message another user directly, rather than post a public comment. (On some platforms, such as Twitter, users may instead refer to PMs as DMs.)
PMs are used to discretely communicate information that is either sensitive or relevant to only the message's recipient. For example, if a user wants to meet you IRL, they will likely PM you their address, rather than post it publicly.