lmbfbo 

Laughing (laughed) (laugh) my big fat butt off.

The comedian was so funny all I could do was lmbfbo.

lmbfbo by Girleegirl November 5, 2013

Lmbfao 

A notorious Chinese hacker. Brother of two other hackers named Lmao and Lmfao, they work for the Koreans.

Interrogator : Now we know than Lmfao is actually working with two other people, Lmao and Lmbfao.

Suspect : No.

Interrogator : This is very confusing.

Lmbfao by Vendin' Machin' Vendin' Machin May 31, 2021

LMFBOAT 

L - laughing

M - my
F - fookin
B - booty
O - off
A - at
T - that

Pronounced like "limf boat" in speech.

Person 1: "Yo! Did you hear about that person that's so concerned about being stalked that they only put their initials on their social media page? I found their LinkedIn profile!"
Person 2: "LMFBOAT! What a scrub!"

LMFBOAT by Xx_bigbrainboi_xX December 27, 2020

LMMFBO 

Imagine an ironic mashup of LMBO + LMMFAO.

Friend1: *sees something hilarious*
Friend1: Sends to Friend2 (DM, SMS, carrier pigeon, etc)
Friend2: "LMMFBO!"

LMMFBO by ImperialFleet1 February 17, 2023

Lmbybo 

Let me blow yo back out

Lmbybo babygirl diz will be the beat sex you ever have

Lmbybo by Youngboy_wolf November 2, 2018

LMBBO 

Let my Bum Bum out ! lyou say it on msn

when someone you don't know talking with you!

1: hey

2:who the hell is this?
1:it's shane
2: i don't know you

1: asl
2:LMBBO ! ignored !

LMBBO by YUS YUS BUM BUM September 4, 2010

LMFBO 

Acronym: Laughing My Freaking Butt Off

Definition: An expression of extreme hysteria. Like LMBO, it is a common reaction to something funny.

Priscilla: "I'm hungry."
Percy: "Hi Hungry, I'm Percy."
Priscilla: "LMFBO!"

LMFBO by mu_ September 5, 2019