Things I learned to say to blend in in the south:

Might could/should ought, as in, I might could do that (this one actually made it onto that map of what your state is famous for), or, you shouldn'ta oughta done that

Store-boughten, as in, did you make it? No, it's store-boughten

Things we say because kids in our family said it and we liked it:

Clo = garment (the singular of clothes misperceived as plural)
DizEE = illness (the singular of disease, ditto)

Uck = stuck

And, my personal fave, Rup, which came from the following conversation:
Me: Aunt Mom's gone to Europe (Aunt Mom was what all our kids called our mom, who didn't want to be called Grandmother)
Twin A, after much thought: Is that my Rup *and* [Twin B]'s Rup?