An overly used acronym used on instant messengers, most people who use it now, don't even "laugh out loud". They just use it when they don't have anything to say in an awkward situation or when someone told a really stupid joke that they don't care about.
queer2066:...and then she fell on the floor and had a broom stick shoved through her lungs.
fenderbender77:...?how was your day?
fenderbender77:ok...well I just found out that I have herpes...and...Jenny was hit by a car, also the other day, I found out that I had type 4 liver cancer too.