Rm
Room
Example
I've been assigned rm 225 at the hotel. What's your rm number?
Rm definition by Slang.net - The Slang Dictionary
This page explains what the abbreviation "Rm" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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RM is an abbreviation for room that is typically used online to refer to a chat room. It may also be used in text messages to refer to any actual physical room, such as a bedroom or classroom. If the abbreviation is used in a text message it is most likely in reference to the location of a person.