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!"
by KKOSC July 07, 2013
Get the mug
Get a MMAO mug for your cat José.