Any person who is always right, and when questioned will come back with something witty that will make you sound so stupid, you will never want to challange again. Personal subjects will be thrown out there, and tears usually follow. Will constantly point out your negatives and will just generally make you feel worse about yourself. This person is usually very good at comebacks and will not take offense to anything.
Person to dickhead: "Are you going to the bar tonight?"
Dickhead response: "Maybe, maybe not, maybe fuckyourself"