Y�know, I just can�t remember the last time I heard the expression �All y�all can kiss my ass!� used. It�s been awhile, that�s for sure. I used to hear it in Oakland all the time, from both African-Americans and, uh, European-Americans. Usually it was shouted across the street by someone (usually female, now that I think of it) stomping off in what can only be described as a huff, although I�ve heard it used with just about every other shading possible. Here in Seattle, it just doesn�t seem to come up in conversation. It�s possible that it�s a regional expression, but I doubt it.
I have to say, I kinda miss it. It has a nice rhythm, flowing like water down a flight of stairs. I like the repeated �all� at the beginning, reinforcing that everyone in the target group is included. The alliteration of �all� and �ass� is pleasing, too.
In summation, I heartily encourage the use of �All y�all can kiss my ass!� in your daily discourse, should the appropriate situation arise. Thank you for your time.