The most badass videogame character. Ever. Commenly seen with a MA5B 7.62mm Assault Rifle and using it to blow the hell outta Covanent aliens. Wears a uber-pimp set of green armor. Never see his face.
Master chief will blow the hell outta those dumb bugs, untill he has nothing left to shoot them with. Then, he will strangle them with their own living guts. -Sgt Johnson on Legendary
by OneOneSeven February 12, 2004
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The Master Chief is done when the man is multitasking and having doggie style sex with his significant other, while playing halo 3. The man then proceeds to stick the controller handles into the ass and vagina cavities at the same time. Be sure to keep the buttons out so that you can finish the fight.

*Note: Experience may change during online play
I got a killtacular while giving my girl the Master Chief last night!

My girl got doo-doo on my controller when I gave her the Master Chief.
by Adam Kelm June 11, 2008
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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."
by Mr. Beef September 15, 2005
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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!"

by Cy_Kill October 22, 2007
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when a chick is sucking you off and you are about to finish you back up and run at her while jacking off and melee her w/ said cock and you shoot your load all over her for dramatic effect. Warning may only work on drunk girls, also spraining of the cock may occur when melee'ing bitches. have fun!!!
Sally is giving an awesome Blow J but you think she needs to be taken down a peg or two, so when you think your done you pull out run at her and while shooting said load onto face you melee her as hard as you can possibly trying to cum in mouth as well. master chief
by Jaron Huff December 11, 2007
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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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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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