A form of slang; slangy speech:weird and wonderful teen slanguage...
In another aspect, we have slanguage, a blend of slang and language.
They have to process every variety of English slanguage, plus Hindi, Urdu, Afrikaans, Tamil and Punjabi, and decide whether it's unnecessary, detrimental, stupid or just plain old banter.
That is an example of slanguage and the teacher is one of our favorites.