Mud Object-Oriented -or- Matter Of Opinion -or- My Opinion Only
One of several kinds of text-based, multi-user role-playing environments, also known as online virtual reality systems, to which multiple users (players) are connected at the same time. Or, if you go to true crime websites, you see 'MOO" all the time meaning My Opinion Only.
Online jargon, also known as text message shorthand, used in texting, online chat, instant messaging, email, blogs, and newsgroup postings, these types of abbreviations are also referred to as chat acronyms.
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NetLingo Classification: Acronyms and Text Message