LMDAO

Web-speak for "Laughing My Damn Arse Off". Derived from LMFAO, and also used in many of the same contexts as LMAO.

"My God, do you live near me? It's a small world! LMDAO!"

Lmdao

Laughing my dumb ass off, or a misspell for laughing my fuckin ass of, Lmfao.

Jen: LMDAO
Rob: wtf?
Jen: sry misspell
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Jen: LMDAO
Rob: u r a dumbass

lmdao

Laughing my damn ass off

That joke was so funny, I'm lmdao.

LMDAO

Laughing my damn ass off

Lmdao the spider ate the frog that was really funny.