In the novel The Outsiders, what does Sodapop mean when he tells Ponyboy, “You're bleedin' like a stuck pig”?

At the beginning of the novel, Ponyboy gets jumped and beat up by a group of Socs. Fortunately, the rest of the Greaser gang comes to Ponyboy's aid and chases the Socs off before they seriously harm him. When Sodapop looks at the gash in Ponyboy's head, he says, "You're bleedin' like a stuck pig" (Hinton 7). Sodapop's comment is a common idiom that refers to anything that bleeds profusely. There are several different origins of the idiom "bleeding like a stuck pig." The most likely origin of the idiom is that when pigs are slaughtered, their jugulars are cut with a sharp knife, causing the pigs to bleed out rapidly. When Sodapop sees the way that Ponyboy is bleeding profusely, he uses this common idiom to express how much blood Ponyboy is losing.