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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 04, 2005
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Nov 27 Word of the Day
A stupid person; it refers to the lack of surface area on an individual's brain. The general thought is that the more surface area (wrinkles, creases, etc.) a brain has, the smarter the person is. Conversely, a person with a smooth brain (no wrinkles) has less surface area and would therefore be stupid.
That fucking smooth brain put his shirt on backwards again...

That smooth brain is dumber than a pile of shit.
by Tip Tank May 14, 2011
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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 01, 2010
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The Slang term came about during WW2 as a slang term for a US Marine.
During the war some steel helmets were made by the Mason jar company.
Some Marines who were issues helmets made by Mason Jar co. were called Jar heads
by Donald Skirvin May 02, 2007
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According to Heritage Press International: Jarhead: For roughly 50 years, sailors had little luck in their effort to insult Marines by calling them Gyrenes. So, during World War II sailors began referring to Marines as Jarheads. Presumably the high collar on the Marine Dress Blues uniform made a Marine's head look like it was sticking out of the top of a Mason jar. Marines were not insulted. Instead, they embraced the new moniker as a term of utmost respect.
Contrary to uncommon knowledge, Marines are not insulted by being called "Jarhead" - they embraced the term with the upmost respect.
by Beau R. May 06, 2019
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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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