Top Definition
This is a simple abbreviation of the uncommonly used phrase "Laugh so much my sombrero falls into my nachos and cheese", this can be used in the context of a lol substitute as the actual lol acronym is slowly disappearing from msn and texts alike.
Person 1: Hey, guess what
Person 2: :O What?!
Person 1: I just got hit by a truck on my way home from work!
person 2: LSMMSFIMNAC
Person 1: this is why i hate you.
by Gavinisthecoolestpersonever April 17, 2010

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The Urban Dictionary Mug

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The Urban Dictionary Mug

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