Lol is abbreviation for lots of laughters.
Lol! His girlfriend slapped him.
originally an abbreviation for "laughing out loud' some people still use it like this but it has been changed into an awkward convo - space filler or if you're mad at someone but don't want to show it.
"Why would you do that lol." (mad)
{hey beautiful what that mouth do} "lol" (awkward)
What did the traffic light say to the car?- Don't look now. I'm changing. "lol that's a good one" (humor)