Any native speaker uses slang words. I'm sure you do too. Beware that slang varies a lot - with different countries, different age groups, even different ethic groups within a country. There are thousands of slang expressions. You would probably be better to search for a list. Here are some: http://www.effingpot.com/slang.shtml http://www.fluentu.com/english/blog/american-english-slang-words-esl/ Sometimes pages like that are quite dated... If you want to look up some words - have a look at http://www.urbandictionary.com/ You do need to take note of the votes though - some people put words on there as a joke...