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This is another one of those internet/text message abbreviations.
In brief: lmtd = laugh(ed/ing) myself to death
As an extreme degree of hysterical laughter, this a step up from rofl or lmao.
"Dude, did you see the Billy Mays auto-tuned vid?"

"Yeah, lmtd!!"
by JD "Lennon" November 30, 2009
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