The meaning of the Acronym UM is...

UM is

• Undefeated Masters
• Utter Madness
• Ultra Maniac

More Meanings For UM:

• User Mode
• Unified Messaging
• Up Mine
• User Model
• Unit Of Measure
• University of Miami, Florida
• University of Michigan
• University of Manitoba
• Ultimate Member
• University Of Morons
• Unique Manuka
• Unfocused Moment
• Unearthed Madness
• Ukrainian Models
• Uplink Message

UM is also in:

• Assembly
• Awards & Medals
• Chat
• Chemistry
• Electronics
• Funnies
• Networking
• Unfiled
• Universities