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.

What happened between you and me
in Cercedilla was a FLING.
Money Heist Season 1, Episode 6

I love you, too, but I could
FLING this card in your eye
The Big Bang Theory Season 11, Episode 8

...or FLING her waste at Priya
is hardwired into her DNA.
The Big Bang Theory Season 4, Episode 19

I'll FLING myself from the cliffs.
Game of Thrones Season 4, Episode 4

So I FLING the hose, I'm grabbing
the cap, I'm screwing in the bolts.
Breaking Bad Season 5, Episode 11