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.

You make sissy
on your BELT buckles?
The Big Bang Theory Season 5, Episode 21

Oh, that is completely below the BELT.
The Big Bang Theory Season 3, Episode 7

Add a BELT and I'll take you someplace nice.
The Big Bang Theory Season 8, Episode 22

by polishing my BELT buckles.
The Big Bang Theory Season 5, Episode 21

Okay, fasten your seat BELT.
The Big Bang Theory Season 2, Episode 5