What does MMO mean?
Massive Multiplayer Online - referring to a computer game that connects sometimes millions of players to an online gaming platform / community.
Other definitions of MMO:
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How to use the term MMO:
World of Warcraft (WoW) is a massively multiplayer online role-playing game (MMORPG) released in 2004 by Blizzard Entertainment.
More slang terms:
Lord of the Rings
Half an ounce (14 grams), typically when talking about chronic.