LMBO 

Let my boner out

When working around the bases with the woman of your dreams you slowly whisper lmbo in her ear.

LMBO by DandyDon6969 February 12, 2010

lmbo 

Acronym for "Laughing my black off". Popularized by Mike Turpinseed Jr. in early 2013.
Something so funny, that you lose skin pigment.

"Mike Turpinseed Jr. is one funny mothafucka!"

"Lmbo!"

lmbo by denys petrov January 11, 2013

LMBO 

Laughed My Butt Off.

It made me LMBO.

LMBO by dsscheibe March 4, 2011

LMBO 

Laugh my bowl off, in reference to Saint Dylann Storm Roof and his signature bowl cut.

Lmbo = lmao

LMBO by Alfred Rosenberg November 21, 2019

lmbo 

short for lmao but for ages 13 below. laugh my butt off

lmbo noice one

lmbo by 0x69 April 11, 2020

LMBO 

"Letting My Balls Out"

"I don't understand Evolution, however I am LMBO"

LMBO by SasquatchBallz April 18, 2020

lmbo 

"Laughing my butt off"

"Laughing my boobs off"

"Laughing my balls off"

They're all implying the same thing; you're laughing incredibly hard. It's often a replacement for "lmao" (laughing my ass off) for people who prefer not to curse in their interweb acronyms.

Person A: *tells a funny story*
Person B: LMBO
Person A: wait, but you're a girl, you don't have balls!
Person B: it can also mean "laughing your boobs off"
Person A: what if you have neither? (somehow)
Person B: then it can mean, "laughing your butt off"

lmbo by A Flying Turtle June 28, 2010