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2.
laughing my mittens off
Nargis: dude are you wearin mittens?
Ramjad: yeh and you just said somethin funny so I'm lmmo!
by AlllllP March 24, 2007
 
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
 
3.
1. Laughing my maps off.
In a moment of extreme hilarity, a map bearing person might find themself laughing so hard that their maps come off.
Mary: Hey, my boyfriend's name is Ignatius!
Anne: Lmmo!!
by Scotlyn Smuggletea August 17, 2009