lmbao 

Lmbao most commonly used in a school environment means "Laughing my bioluminescent ass off"

Justys: "I'm a virgin"
Greg: "Lmbao"

lmbao by Gyeet January 15, 2019

LMBAO 

An acronym used on many African American websites which means "laughing my black ass off."

Various women on the show called, "Flavor of Love" are in love and fighting over Flavor Flav, LMBAO.

LMBAO by Metaview June 22, 2007

lmbao 

laughin my BLACK ass off!!!

also lmmfbao as a variation

ha imma hella lmbao @ this n00b

lmbao by Cozykneez April 10, 2006

LMBAO 

Laughing My Bloody Ass Off

Posh Englishman: Would you like some coffee instead of tea?
Posh Englishwoman: Yeah, sure... *LMBAO*

LMBAO by notenglishatall April 28, 2011

lmbao 

Laugh My Brown Ass Off - developed in the mid 90's as an Asian counterpart to lmwao. Now used by nerds from varieties of ethnic backgrounds.

white nerd: "LMWAO"
brown nerd: "LMBAO"

lmbao by Dr_Nickmo's Guide to Becoming a Cool Asian Nerd November 29, 2004

LMBAO 

Laughing My Bitchy Ass Off

When I think something is funny it always makes me LMBAO!

LMBAO by tweets December 17, 2009

lmbao 

laughing my bad ass off

Katie: We are such bad asses lmao
Jill: You're right.
Katie: Instead of saying "lmao" I should say "lmbao"
Jill: Laughing my bad ass off!!

lmbao by Googlefluff May 4, 2008