It's a Korean term for when somebody is sad.

O- the head
T - the body
L - legs

Google it~ I found it on google as well but yeah it's a.....(there's a term for it but I forgot) symbol used to picture a man hovering on the floor. Like.....yeah, one of the comments below said it.

I thought it stood for 'Oh The Life'. Well we now know how far I am from the real truth ...

Iunno. On the lookout? :>

If you look at it sideways it looks like a man kneeling down on the floor, that's what people feeling like doing when they use it ;D

O = head
T = body
L = legs

= OTL

Korean emoticon expressing desperation /disappointment. :P
Well, it's from google xD

It's like facepalm. I don't know the real meaning though. I usually say lol, but many of my friends say OTL.