English is very flexible thus there's so many different english words in between english speaking countries.
The original ground zero is where the nuclear bomb was dropped in hiroshima.
Words in American english come and go. Trends, especially amongst the youth give creation to new words.
English idioms:
I don't do drugs. (concrete (english))
I don't do mornings (metaphorical (american))
So, meaning very (particulary american)
I am so over him
American english also uses the word "totally" a lot.