The best way to learn proper English is to read news report, and watch news on TV. Watching TV shows is a great way to learn casual English, slang words, understand culture reference and humor. If you have already watched these shows then you may recall the words used in the following dialogs.

Fine. In the parlance
of the URBAN music scene:
The Big Bang Theory Season 4, Episode 20

Maybe it's a
tweaker URBAN legend.
Breaking Bad Season 2, Episode 5

Or a hookup,
as it's referred to by today's URBAN youth.
The Big Bang Theory Season 2, Episode 9

...based on the number of mailboxes and
given typical URBAN population density...
The Big Bang Theory Season 2, Episode 15

- What?
- Again, URBAN slang.
The Big Bang Theory Season 2, Episode 9