I need some help with writing, will you help me? (Details inside).

Okay, I am currently writing a short story in which there is some dialogue with slang involved. I have no idea what to write as I don’t talk slang, neither am I exposed to much of it. I would really appreciate it if some of you jellies could help out on this :)
I wanted some derogatory words for a minor, some words to describe a geek ( I don’t want to use that term) and some other slang words used in everyday life. The more the better.
Thank you :)