While it isn't proper english and yes it is technically slang it is also common with a midwest to southern accent. I have family in Texas who use this term quite often and have seen it's use in literature when a character portrayed is usually mid western to southern as well i've heard it used on tv and in games for the same reason. If thats what you are going for then its use would fit. If not then i'd avoid it but at least if and when you hear or see it used you'll understand it <3 hope this helped a little <3