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.

The thing is, we've got this friend,
and he's kind of down in the DUMPS...
The Big Bang Theory Season 2, Episode 21

But if she DUMPS you,
she'll have a new boyfriend by tomorrow...
The Big Bang Theory Season 3, Episode 7

but if Penny DUMPS me, you're all I got.
The Big Bang Theory Season 10, Episode 13