If you're pugilistic, you're a boxer — or you just like to fight. When you're heading to watch a boxing match, you could say you're going to see a pugilistic event (and you'll sound really smart).
A professional boxer can be described as pugilistic, but a middle school kid who's always getting in fist fights is also pugilistic. Another word for a boxer or a fighter is a pugilist, which comes from the Latin pugil, "boxer or fist fighter." This root is also related to the word pugnus, "fist," and pugnacious, "combative or fond of fighting."