Sentence:  ... Aunt Lucy found out about it and woke me up the next morning with a switch in her hand. . . . But I got all <WSD>mannish</WSD> that morning, Joyce. I said, “Aunt Lucy, you ain't gonna whip me no more. I'se a man now—and you ain't gonna whip me.” 
Meaning of the word marked with <WSD> tags:  Resembling or characteristic of a grown man (as opposed to a boy); mature, adult. (from 16th c.)