I've learned a lot of the Britishisms from reading. But, it's kind of interesting to note that many of these words in the reference Clock provided *are* used in the Boston area. I guess we haven't come too far from our roots. My dad always used the word "arse." I would say at least 40% of these words are used here, or are used in certain areas. In most working class areas around the city, people would know that getting pissed means getting drunk.
When we first moved here, DS #2, age 5, asked DH to buy him a rubbish barrel for his bedroom. I had to translate. Like, he needs a garbage can for his room!