gonna= is going to=future plan
This next video is fast, it needs a LOT of commas, it deliberately contains bad grammar, and it features drug references that I don't completely understand. Even so, I think it's good for listening and speaking. I particularly like the rhythm in the collocations.
cos or cuz=cause=because cuz is becoming really common on lyric videos and in texting.
Don't use "cos" in a formal letter or job application.
If
Do you like to dance? What kind of dancing do you enjoy? Do you ever go to clubs to dance?
Do you have a favorite club in this area?