The most amazing soldier in all of history. As a Spartan II, he was trained to be the best soldier ever. He has saved thousands of galaxies and planets, and is definitely better than Spartacus, pie, the muffin man, and cute puppies. Do not anger his epicness.
Master Chief: Hey ladies, I just got back from saving the universe.

Ladies: OMFG!!!!! SIGN OUR BODIES IN PERMANENT MARKER!!!!!!!!
by The God of Halo 4 December 27, 2012
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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
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The most kick-ass person in the whole fucking world,
Omg Master Chief is a fuckin' rapist!
by teh h4x0rz!!1! July 28, 2008
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Smoking so much weed, that you are prone to passing out.
Last night me and a buddy were totally Master Chiefing when we hit that bong.
by helllloooooo June 23, 2011
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A heavy smoker, able to hit and clear a bong all at once.
I am Master Chief!
by Loganbuuullshit October 20, 2010
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The best most badass soldier ever created and also can take on a legion of (grunts) (jackals) and (elites) by himself
MASTER CHIEF is so badass
by MASTER CHIEF 117 November 18, 2016
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When, in a video game, one runs at full speed to avoid the effects of gunfire and explosives, specifically area of effect explosions.

The theory goes, that if you Master Chief It with enough skill, no one can touch you until you slow down, hesitate or stop going in a straight line.
What the fuck dude, I couldn't shoot you for shit?!

Not surprised mate, I was Master Chiefing It like a bitch
by King Ceri February 8, 2011
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