The English slanguage is composed of all the words or phrases that aren't really words, yet get used on a regular basis through either texting or talking. For example, "brah" or "legit" or "no cap" are part of slanguage.
Dude, they really need to make a dictionary for the English slanguage. Half the time I don't know what people are talking about.
All the cool kids talk in slanguage, no one uses proper grammar any more.