Jar head 

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

Jar head by Donald Skirvin May 15, 2007

Jarhead Copper 

An old ex-marine, ex-cop posing as a sales manager of a car dealership, that gives cars away to military and police personnel, cock-blocking his staff members from making a sales commission.

Hi my name is Steve and I'm an old Jarhead Copper myself! And no one in town will give you a lower price than me! Tell all your military or police friends to come here! I will not make a dime on a fellow jarhead/copper!!!

Jarhead Copper by RoseyPoser November 19, 2010

jarhead

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!"

jarhead by Jay November 14, 2005

Jarhead

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.

Jarhead by Beau R. May 6, 2019

jarhead

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.

jarhead by Headshot1k May 1, 2010

Jarheadtard 

A marine, former marine,a person with a relative in the U.S.M.C, or marine wanna be who takes pride in the U.S.M.C. to the point of absurdity.Jarheadtard are snobbish towards other branches(especially the army) and often talk trash about other branches.They are elitist and literally believe that the U.S.M.C is the absolute bestest military force in the world Eva.

A typical Jarheadtard looks down on the other branches, often calling them pussies(especially the army) despite never having served in the military nor does he or she intend to surve after graduation.

Jarheadtard by CounterSwarmer July 18, 2011

jarhead

jar-head (n) a member of the United States Marine Corps..... OOooraaAAHH!!

Well are you a jarhead?

jarhead by Koko February 10, 2003