A member of the United States Marine Corps. When used by civilians it could be considered derogatory, but it is used often among Marines.

The term originates from the "high and tight" haircut that many Marines have, which makes their head look like a jar. It did NOT originate from their uniform or cover.
"Oorah jarhead, semper fi!"
by Jay November 5, 2005
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A term used to describe a US Marine. Although some believe the term is of recent origin (Gulf War), it has been around for a long time (at least since World War II). It has nothing to do with haircuts, hats or headshape. It refers to the Marines propensity to follow orders, regardless of consequences or personal safety. Because of their single-minded willingness to put their duty before themselves, Marines are said to have jarheads...hard on the outside and empty on the inside. It is a good thing there are such men.
Running up a hill to take a machine gun nest is not something that most people would do, but a jarhead will do it everytime he is ordered.
by Headshot1k May 2, 2010
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jar-head (n) a member of the United States Marine Corps..... OOooraaAAHH!!
Well are you a jarhead?
by Koko February 10, 2003
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A word used by both ordinary people and marines to talk about marines. The term jarhead came out because of the very short hair cuts which resembles that of a jar.
1. Every single jarhead made the mistake of joining the corps.
2. I was made to be a jarhead, i was made to kick ass "Oorah".
by The Kevin December 19, 2005
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The term "jarhead" comes from the shape of the Old Corps covers (hats) that were worn by Marines. The poster is assuming that it is derrogatory, but in fact Marines call each other jarhead as a matter of course.
by davewojta October 28, 2003
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Jarhead. Noun. Slang for Marine. Origin: from the resemblance to a jar of the regulation high and tight haircut. The Marine's head by implication, therefore, also a jar. An empty vessel.
That jarhead got himself blown up during his tour in Iraq.
by Sassygirl91 July 31, 2011
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