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1.
Acronnym for Laughing So Much I Nearly Had A Heart Attack

Often used as either a melodramatic, or sarcastic remark.
Janet: "...And Then The Priest Walked In On Them!"

John: "Ha, LSMINHAHA"
or
John: "Wow, Rofl, Lmao, Lsminhaha... NOT! ¬¬"
by Jayisfap January 20, 2010