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

2 Person: Hahaha I'm LMFSO now.

3 Person: ROFL
LMFSO by iAcidic April 4, 2009
Urban Dictionary Merch
That joke was so funny I that I’m laughing my fucking sack off (Lmfso)
Lmfso by Psychoticdingus May 8, 2018
Related Words
LMFSO Lmfsobbye Lmfsombf lmfsoo LMFAO LMFAOAOAO lmfaol lmaso lmfaob lmfaobidmt
Dude, I know right?! LMFSO!
LMFSO by S. Holmes March 27, 2011
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
lmfso by Jsmells June 30, 2011
Someone references a iconic vine that’s funny
LMFSO
Someone says lmfso means laughing my fucking socks off

LMFSO absolutely not what kind of lame ass definition is that
girl i gotta stop saying lmfao because thats already flat...imma say lmfso so i can be ready for the summer!
lmfso by jada.kimani May 5, 2025

lmfaotic system 

when your lymphatic system is lmfao
Eddy: I just got a 26/40 on the physics test
Joe: Lmfaotic system
lmfaotic system by AlbertiBass November 8, 2018
More from Urban Dictionary
A group of people, typically women, searching through someone’s digital footprint in order to find more information about that person.
Susie wasn’t sure if her new Hinge match was a creep, so she assembled Galantir and they found out he used to post slurs on gaming forums.
Galantir by Ge-sus September 22, 2026
Word of the Day on September 23, 2026
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