When your IMing people and everyone always sayslol without really meaning it. So therefore, when u are actually loling, u say SLOL:
seriously laughing out loud!
Many people use "lol" while messaging, but don't really laugh in reality. When saying "slol" you know they are really laughing.
Coolman343: Hey man, guess what I did?
NoClue87: What dude?
Coolman343: My girlfriend just broke up with me because she didn't like the fact that my penis curvesto the right. She said it doesn't feel good poking into her side.
NoClue87: slol