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1.
A person with an extreamly large head that is shaped like a rectangle or square. Can often be mistaken for a large mallet that is used to tenderise meat. These people will always be the social retard of every event they attend. They don't understand the concept of socialicing. If insulted they will often question you about it the next day on MSN or AIM.
Man 1: Why is the sun actually hitting my face today?
Man 2: It's because Eric and his mallet head are missing today
by Chesstastic June 28, 2007
 
2.
Of or pertaining to one with a vacuous mind, who perceives themself to be otherwise.
He is a mallet head; someone who couldn't pour piss out of a boot if the instructions were written on the heel.
by T. G. Moore October 26, 2006