I started to glance through a few transcripts to see if I could make a quick list of expressions that Tucker used but to be honest, I couldn't really tell if something was particular to southern or even American usage or not because I'm so used to that way of speaking!
For example, in Broken Bow there's:
Fair enough.
Give me a second.
Keep your shirt on Lieutenant.
No kidding.
Grandma taught me never to judge a species by their eating habits. (Which is funny, considering the Kreetasans.)
You know, some people say that you Vulcans do nothing but patronise us, but if they were here now, if they could see how far you're bending over backwards to help me, they'd eat their words.
What in the world?
Could've fooled me.
But I don't know how unusual those would be to anyone else, anywhere else.
Here's a few I've grown up with and hear on a fairly regular basis:
"It's six of one, half dozen of the other."
"You and everybody's dog!"
"Hotter than all hell."
"Now you're just acting like a pendajo(a)." (Spanish for jackass.)
"This isn't my first rodeo." (I.e. this isn't the first time I've done this, jackass.
"Damn, I'm cooking on all four burners today."
"She's two sandwiches short of a picnic."
"The porch light’s on but no one’s home."
"Mom'll tan my hide."
"Who stuck the burr under your saddle?"
"He was X (good looking, nice enough, handy, whatever) but not worth the dynamite it'd take to blow him up." (Okay, only heard this one once from an East Texas lady. Cracked me up.