I'm laughing now, a reply to when someone says something funny.
Invented as the new alternative to LOL by Boom and Hitman.
There are variations of this word such as IFLMAON, INLN.
Guy 1: Why did the chicken cross the road?
Guy 2: I don't know
Guy 1: to get to the other side!
Guy 2: ILN!
(also, you have to be cool to use this word)