Heard in Missouri: "but good!"

[Susan Rosine]

I'm afraid I'll be of no help to anyone on this issue. I've heard it and
used it, but the problem is, my mother is from Alabama, my dad is from
Indiana, I was born in Colorado but grew up in Washington state. So I can't
regionalize it for you, since I'm not really sure of the source (who/where).
  If I HAD to guess, I would think I use it because my mom does, just as I
use "fixin" and "y'all".
I'm fixin' to confuse y'all BUT GOOD!!!
Susan

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