Oh I'm glad I'm not alone with the rOWter cringe.
For the 'merkins, we pronounce the network device "Roo-ter", and the woodwork tool "rOWter".
Also Jaguar is pronounced Jag-You-Are, not JagWaaaah.
Oh, and 'merkin is slang for American... Cos a brit saying "A Merkin" sounds like an American saying "American"... It also happens to be a pubic wig, which just seals the deal in my book!
To go out and get pissed on a Friday night is a normal evening involving no anger. It is also quite common to nip outside work and suck on a fag for five minutes.
Saying "You're mad/crazy" to someone in the UK never seems to cause the same look of horror you get if you say it to a foreigner. I can only assume the rest of the planet are having doubts about their sanity or anger management.
UK ----- US
Tramp = Bum
Bum = Ass / fanny
Arse = Ass
Ass = Mule
For some reason there seem to be a huge number of words only one step away from your backside.
Talking of which... In the UK, a Lady will not ask if her fanny looks big in something, and nobody has a fanny bag!
Use of such words will cause instant smirks from all Brits in a 100ft radius.
Oh, and just because we're lumped in with Europe, don't sit there going um and erm when it comes to measurements and such like, we can use both metric and imperial (we've been using them longer than you have!), and hop back and forth between them depending on which is the nicest number. Much to the annoyance of the French.
Annoying the French is our reason d'etre after all :-)
And remember, just when you think you understand everything an Englishman says, he can just switch to English English (See Austin Powers sketch with Michael Caine http://www.youtube.com/watch?v=PgPH0tYXJrA).