Osu! I occasionally greet people with, "Ehh, howzit?" Those people are my age or younger, people I know well and who have some conversance in Hawaiian pidgin
Now, suppose someone, particularly someone for whom English is not a native language, hears me say, "Ehh, howzit?" to a friend and decides it is the way a reasonably well-educated, upper-middle-class person greets others. After all, they heard me say it, and I make my living using words. Therefore, it must be correct.