Green’s Dictionary of Slang

(US) gossip, cheek, impertinence; also as adj.

1955		B. Schulberg On the Waterfront (1964) 46: He had been beaten for back-talking until his sight was only a shifting screen of shadows.
1999		Indep. on Sun. Real Life 31 Oct. 5: A foul-tempered, mother-hating, back-talking, tit-growing little alien.