To smack another in the head with one's penis, generally in a sexual manner
"I gave my wife a meathead last night after she gave me a blowjob"
by P-M-Dub June 01, 2007
A person, usually male, who made the wrong life choice, wife choice, career choice, for the usual wrong reasons: prestige, pay, perceived power, poltroonery. A person with no clue, who cannot acknowledge this, even (especially) to himself.
"95% of all practicing planners are meatheads." Prof William Nash.

Everyone is a meathead off his own reservation.
by BRL March 19, 2007
A male or female ex-militant who cannot seem to separate their former duties from citizen or professional life; endlessly blathering about their experiences overseas and how those somehow give merit to their current level of intelligence; lift and exercise profusely and yet fill their bodies with the same garbage they were fed during their service; and ironically, appear to have the close-mindedness of an ape on bad acid who's never left their own back yard; experienced their whole service in a neatly-made box with two holes poked in it
Bob: "Didn't Rachel serve overseas?"
Jane: "Yeah, still the same girl."
Bob: "Psh, meathead."
by bittersweetman February 02, 2011
Term given to american muscle car owners who believe that their car is something special when they race and beat a car that comes with 1/3 the horsepower. The american car is often primer and has huge meaty tires on the rear (hence the term) and pizza cutters in the front. Not made for turning, the meat head car is fast in a straight line and on motorways without turns. The meat head car also sounds like an amtrak train or a tug boat.
Mullet-sporting-redneck: Check it out Joebob, I just smoked that ricer in my hemi-cuda.
Import driver: Wow....what a meat head.
by 572 October 23, 2007
Someone who works out at the gym,beats up freshman,plays football, and drinks beer every single day of their highschool lives. They like to eat stuff that is alive and drink gatorade.
Years later when they are out of school, they will have kids who they will beat up because of them striking out in a little league baseball game. They will still eat stuff that is alive and drink gatorade. Then their wives will divorce them. They will still be your head football coach that you know never did well in their lives before.
What a fucking meat head.
by slob696969 May 01, 2006
Someone who pumps himself full of steroids, without knowing what the side effects or consequences are.
That meathead doesn't know what he's doing.
by psycoticadvocate (AIM) April 08, 2005
A person, usually male, who made the wrong life choice, wife choice, career choice, for the usual wrong reasons: prestige, pay, perceived power, poltroonery. A person with no clue, who cannot acknowledge this, even (especially) to himself.
"95% of all practicing planners are meatheads." Bill Nash. Everyone is a meathead off his own reservation.
by BbRr February 07, 2007

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