Although once thought to describe the act of having a fit (i.e., a seizure), it has evolved into a ghetto way to say "fixin' to, about to, or going to do something."
I ain't fittin to take no spelin class.
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Getting ready to do something.
Are you ever going to mow the yard? Ya, I'm FITTIN TO!
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Appropriate, suitable, acceptable
Her behavior at the dance ain't fittin.
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