Means "laughing my ass off", but is mostly used to make conversations non awkward. If something's really funny though, "lmao" will be used in all caps.
mark: yeah
steve: ok
*mark reads message and starts typing, erases, starts typing again, then just stops*
*awkward five seconds*
steve: lmao
rebecca: omg steve farted in class! Jess posted it on her snap story!
stacy: i just watched it LMAOOAOAO
Degenerate WEEBS might use this as a way to say,
“Lick my ass Onii-chan“
l - lick
m - my
a - ass
o - nii-chan(big brother in japanese language)
usually used during Sex
(female after being horny)
female to male : brother lmao
the term “lmao” is an acronym for laughing my ass off
Jim: That was so funny!
Terry: Lmao!