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.

Wow, "Donkey Kong"!
The Big Bang Theory Season 8, Episode 7

I'm just contemplating
Buridan's DONKEY.
The Big Bang Theory Season 10, Episode 7

"hitting the can, the DONKEY...."
Money Heist Season 1, Episode 4

I mean, even Donkey Kong
had Donkey Kong Jr.
The Big Bang Theory Season 5, Episode 12

that a hungry DONKEY placed between
two equidistant bales of hay
The Big Bang Theory Season 10, Episode 7