Slang! --- It's fun to learn street talk!

Is slang a 'bad thing'? It depends. But, it usually the first thing people want to learn when studying another language.
Slang is the language that is spoken right here and right now. Slang is the language of today, combined with the language of yesterday, and the language of tomorrow!
If you know more slang, you'll have more fun to watch movies and to talk to friends on the street!