By sewer zombie:
LOL = Laugh out loud
LMAO = Laughing my ass off
ROFLMAO = Rolling on the floor laughing my ass off
BTW = By the way
IMO = In my opinion
IMHO = In my humble opinion
WTF = What the fuck
I`ve been quite a long time here and have always wandered what the hell means LMAO, ROFLMAO, IMO and IMHO. When I don´t understand a word, there is always a dictionary (I speak spanish)...but this things are diferent.