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1.
An evil laugh. A laugh one does when they are about to do something evil. Such as when a villan has a plot to take over the world, he does this laugh right before it goes into effect. Also a noise made by people who have just gotten away with an evil deed or crime.
Finally, the world is mine! Muahhahaha!
by Stuy The One (Lewis) October 09, 2005
 
2.
A word used when implying that you are plotting something evil.
I have an evil plot. Muahhahaha!!!
by Laurencarakelsi February 07, 2003