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.

...to POP an emotional cap
in his buttocks.
The Big Bang Theory Season 2, Episode 9

So as his head is down,
you know, giving it a snort, just:
Pop, POP, POP!
Breaking Bad Season 2, Episode 1

So as his head is down,
you know, giving it a snort, just:
Pop, POP, POP!
Breaking Bad Season 2, Episode 1

♪ Agent try to come through
Pop, POP, POP, POP, POP you down ♪
Breaking Bad Season 4, Episode 2

He would POP in from time to time
Money Heist Season 1, Episode 10