An adjacetive used to describe a person who is indominatable of will. This person can and will sustain serious, possibly life-threatening injuries as a matter of course in daily life, and then will continue to tredge on as if unscathed, inflicting incredulous amounts of pain on those that get in his/her way. A hardcore person refuses to give up, no matter the odds, or the situation, which can sometimes lead to people thinking the person "stupid." To truly be hardcore one must display wounds and/or scars as if they were medals of honor and constantly impart the amazing stories that accompany such medals with great enthusiasm. This word should only be used to describe the manliest of men.
Jesus man, Dave is so hardcore...Look, he's bleeding out of his eye and he isn't coming out of the game..."