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1.
To laugh as if your evil.
"Your evil!"
"I Know, MUAHAHAHAHA"
by Jebrone February 19, 2005
 
2.
the version of mwahahaha used in the south of Swahili.
MUAHAHAHAHAHA
by SwahilianMuahahahaer. February 14, 2012
 
3.
its just a realy STUPID evil laugh like sumfink off thunderbirds or sumfink. good way 2 annoy people if the REALY wanna find out sumfink
e.g

Jason: " did u ave sex wit my sister ?!"

Markus: "MUAHAHAHAHA"
by MUAHAHAHAHA October 25, 2004