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 17, 2004
A Kick-Ass marine from the future. He's so bad-ass that he killed whole fucking race of aliens and then went home to nail his artifical bitch. He's so bad-ass that when he takes off his Helmet it's Chuck Norris. Nuf Said.
"Master Chief'll fuck a nigga up"

by Duh Boi February 18, 2009
The most badass character in the Halo series.
"We've all run the simulations, they're tough, but they ain't invincible. Stay with the Masterchief, he'll know what to do.
by Arori4 August 23, 2010
The most amazing fuckin' war hero EVER. He completely pwned a whole alien race on a ring planet and can run fast. He also wears some pretty fuckin sexxxy armor. He is the equal to 1337, Pwned, Owned, and anything else in that category.
Geek 1:"Yo (insert name here) Master Chief completely pwnz.
Geek 2(the one who somehow SPEAKS in 1337):"i kn0, h3 i5 p2377y 4w350m3."

2 guys fighting over first player in Halo 3.
Dude 1:"I wanna pwn as Master Chief."
Dude 2:"well im sure as shit not bein arby, he's a gay alien. Im bein master chief"
Dude 1:(while pucnching dude 2 in the face)"fuck u im bein Master Chief. And y shud u be, u didnt even capitalize his name in your quote."
by flamingicicle April 29, 2009
1. The main character of the first 3 halo games (Halo 1, Halo 2, and Halo 3, respectively). He is an advenced supersoldier, comonly reffered to as a Spartan. Chief's full name is Master Chief Petty Officer John-117.

2. Commonly reffered to as Mastur Ch33f, Master Chief is the parter of The Arbiter (or as Ch33f says, Arbitur). All that is known of him is that He r guy hoo gun t33ch u l3ss0n.
Hello I am Master Chief lololololololololol
by Nate Dizzle Fo Rizzle My Nizzl March 18, 2010
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