I know that English copies American but I imagine the opposite also happens.
Some years ago the French went nuts because of all the Americanisms people here use. They tried to invent French terms for computer language. Some exist but people still say what they like. Economics and business terms are very American too.
My Dad said neat whisky and layed off as well as getting the sack. What on earth the sack is I don't know.
We have a slang dictionary somewhere. It can be fun reading through it.