It's what I made a-fixin' lawn mowers and whatnot for Bill Cox.
6 seconds sound clip from the Sling Blade (1996) movie soundboard.
You can hear this line at 02:09:36 in the Blu-ray version of the movie.
Quote context
[...]
- He's in a bad way again with that drinking and a-bein' mean to folks.
- I want you to give me your word you'll do it.
- Well, sure, OK. Has... has... He hasn't hurt them, has he?
- It's what I made a-fixin' lawn mowers and whatnot for Bill Cox.
- Well, how about you, Karl? You want to stay here?
- I don't reckon that you have to go with women to be a good daddy to a boy.
- You been real square-dealing with me.
- That boy, Frank, he lives inside of his own heart. That's a awful big place to live in.
[...]