I say it. I'm over 30, New Yorker (not that that necessarily has anything to do with it). College educated, didn't grow up in the hood - yet I say it. I always have, so have my friends. I couldn't tell you when it started, or why - but it's been as long as I can remember.
Guilty.
Where you at? You coming with?Drives me crazy!
Have you been hanging around a large number of transplanted New Orleanians?
In certain working-class areas of New Orleans, "where y'at?" is the all-purpose greeting of choice, equivalent to "Hi, how are you?" It is so pervasive in certain neighborhoods that the phrase has become a shorthand nickname for people who speak that way; they are referred to colloquially as "Yats". (Ironically in this case, most Southerners think that Yats sound something like folks from Brooklyn.)
To test the New Orleans origin theory, just respond, "Awright." If the speaker looks at you funny, you'll know the person is not really a Yat, just someone trying to sound ethnic.
PS: Yats also say "axe" for ask. (A friend of mine who teaches grade school in St. Bernard likes to have fun with this. These are kids who know Mardi Gras well. My friend likes to write the work MASK on her board and have the kids say it aloud -- every single one of them will correctly pronounce MASK.
Then she will put her hand over the M and ask them to read what it left -- and every single one of them will say "AXE". It drives her nuts.)
Are you in 'Nawlins?
Where Y'at
Is a nawlins expression!
Yat dialect
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Yat is a dialect of English spoken in the Greater New Orleans Area. The term refers to those people who speak with the Yat accent and dialect of New Orleanians throughout the city. The name comes from the common use amongst said people of the greeting, "Where y'at?" (Where are you at?), which is a way of asking, "How are you?" The Yat dialect has its influences from Louisiana French and Southern American English, particularly Older Southern American English as well as from the presence of European languages brought with immigrants to the city. Port cities like New Orleans and New York (with regards to the surrounding Burroughs) have encouraged the growth of similar dialects as both cities attracted many European immigrants during the 19th century. The result has yielded similar dialects which combine sounds from Irish, German, Italian and many other immigrant's speech which have blended with the local dialect to create a new variant.[1]
While the term Yat is usually reserved specifically for the strongest varieties of the New Orleans dialect, the term often refers specifically to speakers of Yat in some parts of the city and the inner suburbs of New Orleans, Louisiana. Though Yat is said to be the language of the Ninth Ward, "Yat" is one of many sub-dialects of the New Orleans dialect that is spoken throughout the city
With what... with bells on? 
To whom did you wish to speak? That usually results in dead air...
I can't stop saying ya'll I try, it just slips out.
.
Y'all is a whole nother thang! Here in the deep South "y'all" has it's own zip code. "Y'all" is probably my biggest language no-no, but I don't care. I am Southern born and bred. I could no more give up "y'all" than I could give up cornbread, azaleas, or pecan pie. 
And that goes double for "ma'am."
