ahem...as a person who is often mistaken for a non-southerner but thrown out of the closet when I go into "homestate slang"
To the millions of us here at least in Texas, its "Ya'll" except those snooty dallasites who want to be all elitist and proper and crap...and Book Publishers...to them it's "Y'all", but they all yanks anyway...we expect that.
Some more fun with Texas slang (these are actual cities..)
Mexia
(pronounced "Meh-hay-yar" or "Meh-hay yah" depending on how long you've grown up in Texas....outlanders are a dead give away when they say "Mex EE AH"
catty whompus
used to describe something that doesn't fit properly or is out of line
frog-strangler
an extraordinary amount of rain
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Women are fisher's of men because we all know....
The small ones you throw back.
The medium ones you eat.
The large ones you mount.