A bad-ass soldier from the video game "Halo: Combat Evolved". Usually seen in green MJOLNIR Mark-V Armor. Synonymous with 1337.
The Master Chief can run at up to 55 kilometers per hour. He is the embodiment of 1337ness.
by Araquiel May 29, 2004
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The protagonist from the Halo Series by Bungie. He could totally kick you ass. And you know it.
Master Chief kicked the Flood's ASS in Halo 1, 2, and 3.
by Dayonic November 4, 2007
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If you're playing Xbox Live, and you just so happen to come across someone with the name "Master Chief," you've been blessed.
Now, there are plenty of people that go under that name and then add excrutiatingly long numbers, but if you see the original "Master Chief," consider yourself a child of good luck.
I was playing Halo 2 yesterday and I met the original Master Chief, so I think I'll go gambling today.
by CyberElectric December 10, 2004
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1)A very quiet character who single-handedly committed ridiculous genocide to an intelligent alien race, while never saying more than a few words.
2)Your typical mass murderer.
hello I am master chief lolololoololololololllollolololol

do u even care that you decimated thousands of grunts, jackels, elites, and hunters who were all brainwashed from the dogmatic "prophets?"

by pnguyen December 14, 2007
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Short for Master Chief Petty Officer. The Master Chief Petty Officer is the ninth, and highest, enlisted rank in the U.S. Navy, just above Senior Chief Petty Officer, and is a non-commissioned officer. They are referred to as Master Chief in most circumstances.

Advancement to Master Chief Petty Officer is similar to that of Chief Petty Officer and Senior Chief Petty Officer. It carries requirements of time in service, superior evaluation scores, specialty examinations, and peer review. A Senior Chief Petty Officer can only advance if the existing master chiefs approve.

A Master Chief Petty Officer is purely administrative and is usually tied closely with the Commanding Officer, except possibly when the command is very large (e.g. an aircraft carrier). Their uniform reflects this administrative duty; becoming similar to that of an officer, albeit with different insignia than an officer.
The master chief came down here and busted those guys asses for being drunk on board ship.
by jt October 18, 2004
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The main character from the Xbox and PC game Halo. As a boy, named John, he was captured along with several other children by an organizations who's goal is to train kids to be super soldiers by their late teens. John, along with 20 some other "Spartans" passed the training and have fought some of the most amazing battles known to man.
The Master Chief walked into the bar and sat down. Then he pulled out a deagle and shot everyone in the head.
by Michael Mahoney April 15, 2004
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