The meaning of the Acronym MMO is...

MMO is

• Marvel Mystery Oil

More Meanings For MMO:

• Memo writer file (RapidFile)
• Mass Multiplayer Online
• Multi-Model Optimization
• Marvel Mystery Oil
• MegaMan Original Series
• Money Makin Operations
• Memory Map Overlay
• The Macao Mathematics Olympics
• Multi Media Online
• Massively Multiplayer Online
• Multi Msomething Online
• Materials Management Office
• Monthly Market Outlook
• Materials Management Office
• Materials Management Office

MMO is also in:

• Electronics
• File Extensions
• Funnies
• General
• Military
• NASA
• Stock Exchange
• Unfiled