Top Definition
MMAO is an abbreviation for the term used to describe a person who is moaning their ass off about things that displease them. They can also be referred to as a buzz kill or buzz killington.
"Oh god you were totally MMAO last night, you killed the mood for everyone laamme!"
#moaning #buzzkill #loser #jerk #buttass.
af KKOSC 7. juli 2013
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