LMFNO 

An abbreviated form for the phrase, “Laughing My Fucking Nipples Off.” Its purpose is to create a more expressive illustration of great laughter or amusement, similar to LMFAO (which means, "Laughing My Fucking Ass Off.") The term is commonly used on the Internet, online and conversations across gaming/chat rooms or texting.

Girl: Do you believe in puppy love?
Boy: I tried it once, but their assholes are too small.
Girl: LMFNO!

LMFNO by samcaba January 10, 2011

LMFNO 

Laughing My Fucking Nuts Off

I was LMFNO when i heard that Palin is running for president.

LOLLMAOLMFAOLMNOHaHa

LMFNO by georgeyea June 16, 2011

LMFNO 

Acronym: Laughing my fat nuts off.

May be used as a substitute for other similar acronyms such as lmao, lol, ect.

Person 1: Yeah, and then he STEPPED in it!!

Person 2: LMFNO!

LMFNO by Dritto December 14, 2004

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

LMFAOAOAOSOAOAOAHSNEKNSHDOSNEBKSOWOSHSHDNEKLWMEHRIDJE 

How an extra mf types LMFAO

* something funny *
Her extra ass : LMFAOAOAOSOAOAOAHSNEKNSHDOSNEBKSOWOSHSHDNEKLWMEHRIDJE

LMFAOAOAOSOAOAOAHSNEKNSHDOSNEBKSOWOSHSHDNEKLWMEHRIDJE by Starship470 March 14, 2019

Lmfao 

Is known as a Chinese hacker who works for the koreans. he's also known to partner with lmbao

LMFAO, he's a Chinese hacker

Lmfao by Communist_comrade/69420 June 3, 2020

LMFAO 

A laugh so powerful that it's basically saying that you laughed your ass that was fucking so much that your ass literally fell off.

Guy 1: Yo look at this meme!
Guy 2: LMFAOOOOOOOOOOOOOOOOO
Guy 1: Uhhhmmm.. yeah that was funny and all but why are there literally 2 giant pair of cheeks rolling across the floor now..?

LMFAO by warp_d June 25, 2022