Based

It seems to be some sort of urban slang thing, perhaps a suggestion that he is homosexual.

So is it something negative? I just found a list of definitions on Urbandictionary:

http://www.urbandictionary.com/define.php?term=based

But there, it seems to be a positive word, describing someone who does not care what everyone else thinks. I am very confused now.

And I f

I wouldn't spend a lot of time on it. Only a certain kind of person can use such language with aplomb, anyhow (and it ain't me, and I doubt it's you).

Thank you enoon. Maybe someone else knows, I am very keen to know what it means because I have seen this expression quite a few times now.

So it does not make any sense to you either, Clive? Yes, I am aware of that fact, thank you for the links.

I don't think it's a corrupted part of a headline, because it appears isolated numerous times on different web sites, just do a google search on "based breivik". Here's another example:

"Seriously, it's so bad that in the UK you can lose your children based on yo

Thank you Clive, and thanks for the link. I'll see if I come across this expression in other contexts, because I have seen it not only in connection to Breivik, but with other names too.

Maybe it is some chat forum style of writing.
eg [based Clive:] meaning 'Clive says . . . ' ?

I came across this word another time, this time in a random comment on YouTube:

"F*** you, haters. He is so based that he **** ur mum last night"

Really sorry about the language, but I had to add the 'context' somehow, in case it helps. So again, what does 'based' mean here?