A shortened version of “laugh out loud”, mostly used in text messages when you’re too lazy to come up with an actual response. Greatly overused in daily life to the point where you don’t even give a fuck about what other people say to you.
Friend: My dog just died.
Douche: lol
10 minutes later
Douche: so wut ‘bout dathwessay shit you letting me copy? lolololol
LOL in all caps means she wants the D lol in lower cases means friendzoned
However, Lol! means friends and Lol!! or Lol!!! means take the hint
Guy (listening to Lost In The Fire in video where fitness model performs hammies and glutes): Keep the lights on *smirky face x2*
Involved girl: LOL
Another girl: omg why do I find this so funny *cry emoji x2*