I saw the phrase in some texts but I am not sure that I've got the meaning of it. Does "wild dog" mean "crazy"? Could you please explain it to me?
The full text is here:
“A man ought to have a real belt,” Dad said at breakfast on the day Luke was well enough to return to the junkyard, handing him a leather strap with a steel buckle. “Not Luke,” Richard said. “He prefers twine, you know how fashionable he is.” Luke grinned. “Beauty’s everything,” he said. FOR EIGHTEEN Y EARS I never thought of that day, not in any probing way. The few times my reminiscing carried me back to that torrid afternoon, what I remembered first was the belt. Luke, I would think. You wild dog. I wonder, do you still wear twine?
Educated by Tara Westover