Y'know, I've always wondered. Growing up with television, I know how to mock just about every accent there is. British, Middle Eastern, Indian, Dutch, French, Yiddish, you name it. The one thing I've always wondered but never found out is:
Exactly what does an "American" accent sound like? I mean, as an American, I know how to mock regional accents ("Oh yah, you betcha hon." in Minnesota, "Fuhgettaboutit! I'm walkin' here!" in New York, "Like, dude, totally." in California, etc.), but as for you non-American folks, in what sort of manner would you mock America in a generic/stereotypical way? Now that I'm on an international forum, I might as well ask.
I'm suspecting the common answer will be a Southern accent ("Yee-haw! Howdy y'all! Imma go rustle me up some grub!"), but what about if you discount this one?

Edited for proper grammar and whatnot.

For mockery purposes, most of the people I've talked to who are from other countries like to mock a southern drawl, punctuated by Tourette's-like ejaculations [url=HAHAHA HE SAID EJACULATIONS. Yes. That's also the correct use of the word; it means something said quickly or suddenly][/url]of 'Murica! Except Brits (specifically Englishmen) who just get chuffed about taking the piss out of us and laughing at how pants we sound. Or some stuff like that. I don't really understand English slang ;)

EDIT: There it is. I laughed a few times at Patrick Stewart as an American everyman on the Colbert Report.

The thing is, you seem to think only other countries have one generic accent, while your own country has regional accents. The fact of the matter is that other countries have just as many regional accents as the US, they just sound more alike when you don't speak the language in question. However, you specifically mention the "British accent", which is a bit odd given that they speak the same language as you, and you should be able to tell different British dialects apart. They are just as varied as the American ones.

What Wishbone said, there are many regional dialects in the UK but if you hear an American do an English accent it is always either Cockney or posh.

Well, I mean, I know that lots of different regional accents exist. Of course in British, there's the Mayfair "Good Lord! I do say, old chap" accent, the Cockney "Could you lend me an Oxford to get some Rosie Lee, guv?", and so on, but I'm saying the accent one would use to typify the country overall. For Britain, a majority of people (at least here in America, anyways) would mock them using a posh-sounding voice rather than a rough slang-y one, since we stereotype them as being really uppity people.

Most can't even tell the difference between an Aussie and an English accent let alone regional variances.

Many American shows right now are dubbed into my language here. And in these shows American got no special accent. You can still find many old movie where you find a strange accent but I think is not a real regional accent. Usually it is just some American that seem to try to speak italian, with some English word inside the sentence... Right now I only found this example:
https://www.youtube.com/watch?v=uotbEeyleXA

Also, in the dubbed version of a show, there is no difference between accents in different country of US.

Fake British, Mexican, Russian, Chinease, German accents are, on the contrary, more common.

PS. In italy there are already lots of regional accent. Many of them are really different from the italian language. The Milanese is much more similar to German, The Piemontese is more like French, Sardo is a real language, Sicilian and Tuscan are the Italian bases with the dead language Latin. But if you try to talk with me with any of these I will not understand you at all, because I only know Italian and some English.

I have always considered the american accent to be a bit whiny, but the fact is we hear it so much that it is quite normal, and does not stand out.

Probably because the UK doesn't exist as a lot more than London in most peoples minds. Kinda like Germany is nothing but Munich and Oktoberfest.

And Fräuleins, I love Fräuleins.

That's about it. Then again at least earlier people would call all Americans (from USA) "Yanks", no matter which part of US one would come from. So a fat Texan wearing a stetson, who can be referred to as a "Yank", you see?

Here's one TV commercial showing some stereotypes of "Americans":

https://www.youtube.com/watch?v=7z9xT6JUZsI Easy, you just put "mate" at the end of every sentence in Australia, like "This is a knife, mate.".

Having said that, since they don't (fortunately) dub TV programs nor movies here and we do get some TV series, documentaries etc. from different parts of the world, one tends to pick some nuances in different English accents by just watching those programs. Like two days ago I watched the Australian movie "Last train to Freo" on the TV, and quite often they also show that Australian border documentary.

Of course those don't necessarily help picking up regional accents within a country...

If I was to pick an overall "American accent", I'd go with Hardrada: A bit nasally and perhaps whiny.

Reminds me of when I attempted watching Mad Max and had to turn subtitles on. There was also a dub into more standard English on the disc... Seems the Australians understood that most non-Aussies cannot understand otherwise.

There is no such thing as a British accent. I would love to see you convince and Irishman or a Weegie to talk like a guff in Londonstan.

Some background music to listen to while reading the thread:
https://www.youtube.com/watch?v=xfSJEWNTvo4