What does chunking at people mean in to kill a mockingbird?

"Chunking at people" in "To Kill a Mockingbird" refers to the act of throwing rocks at someone, typically with the intent to harm or intimidate. In the novel, Scout Finch observes a group of people "chunking" at her father, Atticus, as a form of aggression due to his defense of a black man accused of raping a white woman.