LLOL

Literally Laughed Out Loud

the regular lol has evolved into not really meaning that you laughed out loud. now it's sort of a text message filler or something you put when what someone wrote made you smile or it can even be used when you don't know what else to say

I just got caught playing on my phone in class because I watched the video you sent me and it made me LLOL

llol

literal laugh out loud
people say "lol" without actually laughing out loud, so to emphasize the fact that one ACTUALLY laughed out loud, one must say "llol"

"that was so funny, i llol"