English term (edited): the meaning of

First of all I suggest well-respected friends of us like writeaway to mind their own business which is translation actually and dispense with people's "rudeness". I would just simply try to answer our colleague's question rather than teaching a grown up person some manners. I personally think David has already done good, and I found nothing wrong with the way he brought up the question.

"You is" in English slang is used sometimes not only among those who are "Uneducated" (because obviously every native speaker of the language is already fully aware of the function of You and Are.) but also since there is no singular form for "You" in English when addressing a close person in intimate talks socio-linguisticly a person [specially men's communities] tend to find a solution for a singular YOU which sounds more intimate, so they use "IS" with you which decreases the formal semantic load of plural "You" and gives the context a kind of more friendly and intimate atmosphere. This phenomenon is discussed in Julia Falk's Language and Linguistics and many more classics as well.