I love listening to British accents because they sound so proper to me. :3
Oh gosh, I go to a British school despite being American and it is weird. This isn't particularly slang, but they have different names for things:
(Also, no offense to any British people around, this is just me being patriotic and closed-minded xD)
American Word - British Word
Eraser - Rubber
Math - Math
s (This one makes sense since it's mathematic
s but still)
Trash Can - Dust Bin
Trash - Rubbish
Soccer - Football
Pants - Trousers (Apparently 'pants' in British English roughly translates to 'underwear', whenever I swap the words my friends laugh at me -.-)
Cookie / Cracker - Biscuit (NO, these are a different sort of dessert I'm telling you)
Chips - Crisps
French Fries - Chips
'I'll tell on you / I'll rat you out / ect' - 'I'll tell you off'
THEN THEY WRITE 'color' AS 'colo
ur'. IT ANNOYS ME SO MUCH. On a lesser scale, there is also 'aluminum' and 'alumin
ium'.
There are more, those are just the ones I can think of off the top of my head.
Also, living in Thailand (yes, I'm an American going to a British school in Thailand, what of it?) the Thais refer to basically any foreigner as a 'farang', which is basically the Thai word for foreigner, but since foreigners use it as well to refer to other foreigners I think that counts for something. xD