kgi:

You got that right!

Y'all is plural, You is singular.
M'am (but never lady) and Sir show respect and you use them to address all adults.
You say "stop on by sometime" and really mean it.
You eat your black-eyed peas and greens every New Years Day, Or else.
Bar-B-Que is a mystical experience.

People in the North have a congental inability to understand some of these things. That's why we call Yankees, "Yankees". They just don't git it :-)

A transplanted Texan.
Gutbucketeer

Some other expressions from my child hood.
"Come to Jesus Meeting" - When meet with someone to resolve major issues.
"Cooking with Gas" - Really working well now
"better than sliced bread"