There are so many English slangs now that it's hard to list them all! A good website to use is: http://www.urbandictionary.com/ There are loads of mainstream phrases and words there, and it's really useful when you come across slangs you're unfamiliar with.

Like Paul said, it is hard to just tell you slang words. Everyone uses their own slang, depending on where you are, who you're talking to, and the type of person you are.

In what context, we use slang words for many different meanings and circumstances. Tell us when and how you want to use slang.