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It stands for Laughing my fucking socks off.
Or also a commonly made mistake
when trying to type LMFAO.
1 Person: ~tells a funny story~

2 Person: Hahaha I'm LMFSO now.

3 Person: ROFL
by iAcidic April 04, 2009
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Laughing My Fucking Sauce Off
mostly used by bros and Hockey players
Kyle-ay did you just see that plug throw that shitshow pass
Joe-Yeah pure dust LMFSO
by Jsmells June 04, 2011
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