How can British people understand American slang, but vice-versa no?

[TheTerminator]

Yes. Wouldn't say it was a bad thing though.

The only point I find slightly irritating is that Americans insist on calling football "soccer".

[sashmead2001]

It's entirely to do with the amount of exposure British people have to American English, compared to the amount American people have of British English. On terrestial television, I would say that less than half the programmes are American, though.

[Bernard Manning]

Same goes for a sense of humour

[floppity]

Yeah, most of our films are american, plus, you guys aren't really that imaginative when it comes to slang!