See, it's funny, cause that makes it seem like there's serious business goin on, cause this is a Real Blog.
So I'm pretty intrigued by the idea of a troll as a new name for a sub-genre of comedy not tied to the internet. As in, yes, it's very related to the internet but I don't think the internet is integral to its definition. Think of someone who shows up in the crowd at a protest with a "We have no idea what we're talking about" sign. I think even streaking is in the same spirit.
I tried to come up with a definition that doesn't mention posting it online as being requisite:
"Misrepresenting oneself in an offensive or disruptive way for the purpose of comedy. The audience for the comedy consists of the "comedian" himself and those in the disrupted community who understand the humor."