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Master Chief 

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.
Master Chief by Michael Mahoney April 15, 2004

Master Chief 

i think mastur ch33f are a pretty cool guy. he kills aliens and doesnt afraid of anything.
master chief is what comes out of a can of whoop ass
Master Chief by Just Shut Up March 8, 2009

Master Chief 

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"
Master Chief by Duh Boi February 19, 2009

master chief 

A mixed drink modeled specifically for gamers, namely those who play Halo and Halo 2. Made by combining Bacardi 151 and Mountain Dew. Great for late-night Halo 2 Live sessions. Also great for vomiting.
"Man, I keep getting my ass handed to me by some n00b, I had better have another Master Chief."
master chief by Mr. Beef September 27, 2005

Master Chief 

John, or Master Chief Petty Officer 3rd Class. (Spartan-117) is the main protagonist of the popular video game, Halo. he has many augmentations including, hight damage reduction, sight, and speed.
the master chief is one of the best video game characters of all time
Master Chief by Chris000 July 17, 2006

master chief 

The only person more badass than Spiderman, Superman, David Hasselhoff, Megatron, Optimus Prime, Batman, Goku, 50 cent, and Ryu COMBINED.

And contrary to popular belief, he is also a mac-daddy pimp.
Master Chief-"I'm the shit"

Every1 in world-"we know!"
master chief by Cy_Kill November 7, 2007