Aii. I am from England and now live in the US so I'm good with these.
Bloody was taken from Bloody Hell, which is not swearing it is blaspheming *sp* and it now just gets spattered in, in all different kind of ways, the American Equivalent would be "goddamnit", depending on where you are this is looked at with varying severity.
There is no US equivalent to "chavs". They just don't exist out here THANK GOD!!
Wanker is a word used in certain parts of the US, as is Twat, I have only heard it used by people from New York and New Jersey where there a lot of us English folk, and twat does mean that especially lovely part of a lady out here too.
A few more I can think of --
Americans don's say the H in HERBS, but the brits drop h's off any and all words.
Chips = Crisps
Cigarettes = Fags
Fries = Chips
Cookies = Biscuits
Tired = Knackered
Testicles = Bollocks or Bollox
Trash can = Bin
Sidewalk = Pavement
Traffic Cirle (few and far bewteen out here) - Roundabout
Sedan = Coupe
Truck/Tractor Trailer = Lorry
Condom = Johnnie
Jerk/Off = Wank/er
Gas = Petrol (Short for petroleum)
Fanny = Vagina
And ofcourse we have missed the most obvious one
Football = Soccer
This is the only that really gets me, cause many times I have been asked why we call it football!! For the record, the US is the only country in the world to refer to another sport as football, and the question really should be. Why do you call a game that you only use your feet in for maybe 1% football? Not to mention that US Football is a direct rip of the British game of Rugby, just with pads added a few different rules and a slightly adjusted playing feild.
Bollox can also be used in may different ways, like instead of saying "Oh S**T" you would say "Oh BOLLOX", but it can also mean the babymakers, and you would say "mate I just got kicked in the bollox"
Pissed in the UK means drunk, here it exclusively means to be pissed off. Also in the UK I woudln't use the word infront of a child, but here it seems fine.
As getting drunk is now the major past time in the UK, we also have numerous other words for it , plastered, mullered, wankered, wasted, twatted, pissed, mashed, f**ked up, blotto, smashed etc..
Also in the UK, due to WWII we refer to any American as a "Yank". When infact within the US, Yanks, are those only from the north. Apparently you have to be from the north of the Mason Dixie line, which is the old Civil War line between North and South if I am right. Americans, if I'm wrong please feel free to correct me.
We don't have an equivalent to Thanksgiving, and no offence to who ever brought that up, but if you actually think about the reason for the holiday why would we?
Brits, you might find it interesting that in the US they don't have Boxing Day, though they do in Canada. It's a wierd thing, Thanksgiving is always a Thu. and you always get the Fri after off too (this is the biggest shopping day of the year in the US), but you don't get the day after Christmas off. Doesn't make much sense too me.
I think thats plenty for now.