To respond to an insult by answering while clapping your hands in rhythm of your words, in order to add empahasis. Common among outraged ghetto women...
He told her to get out of his face. She gave a clapback by saying "I(clap) will(clap) get(clap) in (clap) your(clap) face (clap) when (clap) ever (clap) I (clap) want(clap)