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1.
A loud noise that is made during an awkward silence.
-silence-

"murmur!"
by Mimi121 June 29, 2008
 
2.
When you can't hear someone when they talk
Zack says, "You are an acute angle." Armen says, "Zack I can't hear you, you are mur muring."
by Armen Melikian November 13, 2007
 
3.
When someone is being annoying and you cant understand what they are saying.
Zack say, "Shut up Armen" Armen says, "Why are you mur muring"
by Armen Melikian November 14, 2007