CHAT: Southern word

I got this in a newsletter:

>-----------------------------------
>TODAY'S SOUTHERN WORD OF THE WEEK
>-----------------------------------
>
>UNLADDA (adjective).  A grade of gasoline.
>Usage: "I'm gonna fill up my new truck with unladda."
I usually guess the meaning with help of the usage
example, but this one beats me. :)


--Pablo Flores
  http://www.geocities.com/pablo-david/index.html
  ... I cannot combine any characters that the divine Library
  has not foreseen, which in some of its secret tongues do not
  bear some terrible meaning. No-one can articulate a syllable
  not filled of caresses and fears; which is not, in some one
  of those languages, the powerful name of a god...
                   Jorge Luis Borges, _The Library of Babel_