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1 definition by dreakaye

 
1.
Laughing My Mustache Off. Used online or in person.

When extreme hilarity causes the facial hairs of the philtrum to jump off.
Mario: Mama mia, I have fallen into a large green pipe!
Luigi: LMMO!

And thus, Luigi and Mario had one less thing in common.
by dreakaye November 06, 2011