A certain type of person that exhibits the epitome of being any/all of the following: a jerk, an asshole, a douche bag, a dickhead, a tool, a faggot (not in the homosexual sense), or a twit. Any single person cannot label more than five people with this because it is reserved for only the most heinous individuals one may meet. This term is applicable to a boy or girl.
I forgave my dickmuffin for coming home drunk.
Dick McMuffin: Don't bother, I'm already on the team and there's no way you'll beat me. I'm so much better than you and everyone else so don't waste your time man.
John: My point exactly.