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.

Eh, it gets a bad RAP from shows like
Jersey Shore and Real Housewives.
The Big Bang Theory Season 8, Episode 22

I could bust out
a little RAP.
The Big Bang Theory Season 7, Episode 6

And it's only
his first dealing RAP,
Breaking Bad Season 2, Episode 8

To be honest with you guys, when
I was your age, I wanted to be a RAP star.
The Big Bang Theory Season 6, Episode 18