Short for MMORPG (Massively-Multiplayer Online Role-Playing Game)
I wasted my youth on that MMO.
by mesolimbo April 12, 2005
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acronym for Massively Multiplayer Online game. MMOs usually involve a free download and recurring monthly fee for gameplay. The most popular MMOs are MMORPGs. One such game is World of Warcraft
Freelancer and Vendetta Online are some little-known MMOs
by Cunjo October 26, 2005
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MMO (emm emm oh)
noun. Informal.

Massively Multiplayer Online Role Playing Game MMORPG
A game that can typically be played with only the left mouse button. Many cost money per month to play online, unlike other games. Requires minimal skill but maximum amount of time playing. Gameplay usually involves performing some simple action(s) thousands of times repeatedly to "level up".
"World of Warcraft is a great MMO, 15 dollars per month well-spent."
by dale5605 December 13, 2005
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A video game where the player controls a character in a world inside the computer. The goal of most MMOs are to advance your character, build up his armor, weapons, etc. Some MMOs actually allow you to buy houses from players who are architects, weapons from weaponmakers, clothes from tailors, etc. Many MMOs cost on average $15/mo (USD) -- although Guild Wars is the only current free MMORPG.
In sacrife of my entire summer, I mastered the professions of pistoleer, ranger, chef, tailer, and architect in the cool new MMO!
by videogamer October 20, 2005
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An MMO is a "money making opportunity"
Bro, this girl just called me today and said we could break the bank if we close this deal cause her client is loaded. Do I smell a MMO?
by Mickey Mac August 10, 2011
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