Originaly slang for someone who is Hydrocephalic , but which has now come to refer to any severe idiot or retarded individual.
Jones you mindless waterhead, how many times do I have to tell you not to stick the plastic bag over your head and play astronaut?!
by Stephen Daedalus June 10, 2007
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otler

Otler lacks common sense so Makanuchi Kim called him a waterhead.

The waterhead came into ventrilo and did not say a word.
by WooWoo Brothers April 18, 2006
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A person who is very much less than intelligent and may border on retardation. A person who may be the offspring of an incestuous union, such as siblings or parent/child. The person may exhibit traits such as an enlarged head or eyes that are set too close together.
nimrod moron ditchdigger
Waterheads make me laugh because their eyes are so close together.
by undertheradar22 January 23, 2014
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Cant complete simple tasks or objectives without screwing them up and making things worse than they are.
Jonesy is such a waterhead
by M0nks July 30, 2006
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Waterhead (noun): According to the outlaw-journalist Dr. Hunter S. Thompson, a waterhead is a weird (in the lowest sense of the word) individual, often of some social/political power that achieved said power through nepotism or by being a Greedhead.

It is implied that this weirdo has no brains & no real value other than to be Doomed. A waterhead behaves as a stooped, irrational blemish to his/her country.
From "Where the Buffalo Roam", based on the twisted legend of Hunter S Thompson:

The Gallow brothers -- Ernest and Julio -- party guys who had skinned a few Mexicans and forced them to carry them on their shoulders down to the pre-game tailgate parties at the colosseum. The Pepsi and Coka Cola bottlers of America -- Coke adds life; It's the real thing -- bombarded by missiles; flying flaming matchbook covers. The waterheads from General Motors up in the top seats where they belong; getting the worst of the pollution. All sorts of weird motherfuckers were at the game.
by Painted city March 13, 2013
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When someone is completely lacking in any common sense whatsoever; a very stupid and clueless person
That nutter over their just dropped the tree limb on A customers vehicle. That kid is a fuckin waterhead
by Kyle Whyte February 18, 2018
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