Woo hold your horses... (huh?)
I know "what's up" and it's variants "sup" and "wussup"! (West Coast?)
I know dollars can be called bucks or green as well.
Also some funny expressions like "kick the bucket", "bite the dust", "kick back", "beat about the bush" and some others!
Never been to the States before, nor any other native English speaking country. My sources are the media!
Note: media is plural
Oi Oi Oi !!!
This one will stretch your brain to work out.....lol
If you need an explanation I will post at later date.