Answer :

0Claudia0
Well, most slang words that have been used for a long period of time have been added to the dictionary, but then again, some other slang words have not. So, it really depends on the word.
But, for a straightforward answer i would say yes, just because some slang words are in the dictionary.
~Hope this helped
Shadowolf
Slang is not proper english and part of standard english. Slang is considered informal and afton times vulgar. Teachers and professors will mark it against you when you use slang in essays or papers. So I don't think it as a type of english for use in assignments.