LMFSO 

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

Lmfso 

Laughing my fucking sack off

That joke was so funny I that I’m laughing my fucking sack off (Lmfso)

Lmfso by Psychoticdingus May 8, 2018

LMFSO 

Laugh my fucking socks off.

Dude, I know right?! LMFSO!

LMFSO by S. Holmes March 27, 2011

lmfso 

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

LMFSO 

Laughing my fucking soul out

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

LMFSO by Who_tf_comesupwiththisbullshit February 28, 2021

lmfso 

Laughing My Fucking Stomach off

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