The really delayed lol that people add to the end of a sentence when trying to cover their ass cause they just did something regrettable online.
The safety LOL often fails and is therefore usually followed by a JK
Guy: Hey, hot online girl wanna hang out sometime, just a little one on one time?
Hot Online Girl: ...
Guy: ... LOL, just kidding
Hot Online Girl: Nice safety lol. I almost thought you were joking for a moment, jerk *block guy*