A combination of Ad Hominem and Ad Verecundiam which basically alleges that the opposition must be stupid, racist, cruel, immature, or something like that in order to believe whatever it is arguing. After all, 'Everybody Knows' that the argument has been proved false for centuries. You don't actually believe it, do you? You must be a genuine extremist in order to believe it.
(e.g., "What, you oppose a ban on pornography? Well, we know what you're looking at, you Censored Expletives...")
This fallacy can frequently be a path to Godwins Law. -- Edward Kiser
Like the other fallacies it is based upon, it has nothing to do with the real content of the opponent's phrase.
Polls are also used as an argument from intimidation; by polling people who don't know a lot about an issue and who therefore deliver the wrong answers about it, pollsters can intimidate the well-informed minority with the majority result. i.e. Argument By The Masses.
It is also a form of Argument From Intimidation to simply shout the same point so loudly and so often that it drowns out the opposing point of view. Sadly, a lot of people argue in this manner.
[Moved from Ad Verecundiam]
"It's so, because I say so." Anybody who says this has to reach for a gun sooner or later. -- Ayn Rand
See: Fallacious Argument
See original on c2.com 