just a dumb thing people type/text meaning "laughing out loud" or "laugh out loud" when they still have a straight face on.
Average teenager 1: I think I just farted
Average teenager 2: LOL
Average teenager 1: u rly laughing
Average teenager 2: well.. not rly.
Means Laughing out loud (LaughingOutLoud)
(someone says a joke)
(the person types after:
LOL
Lol is a term of slang used online as a form of expressing a laughing feeling.