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cuase of sudden GPA drops in highschools across the world.
PRE-HALO 3:
little billy was a straight A student, turned in his work on time, always on time for school, and never fell asleep in class.
POST-HALO 3:
little billy now is a nocturnal energy drink chugging pasty white as snow trash talking FIEND that goes by an alias known only to him and other xbl affiliates.

lil billy will be missed.....

HALO 3 by BE_PREPARED! October 9, 2007
Related Words
A hat specifically used to keep the Xbox Live headset to your ear while playing Halo 2 after the clip on it has broken and can no longer snap onto the headband. Mostly required due to the fact of poor design on Microsoft's part, why they made it in two parts is still a mystery. Thankfully they corrected their mistake with the 360 headset. Beanies work the best by far.
*signs on to Live*
*joins PPD's party*

OMK: Yo

PPD: *muffled noises*

OMK: What?

PPD: *Thump* Hang on man *Shhf* I gotta get my damn Halo Hat *Scrff*

OMK: Just buy a new mic dude...
Halo Hat by Danves September 17, 2008
your girlfriends worst nightmare...
(GF. on the phone): hey babe whacha doin?
(BF.): ....... yes double kill!
(GF): huh? what are you talking about? Are u on halo 3 again?
(BF): ....... umm ya...cant talk now..call u back later..bye
halo 3 by brennan parker March 4, 2008

Halo Reach

The fifth Halo Game made by Bungie studios to be released in 2010.
"Halo Reach is a very anticipated game for many people who call themselves gamers, and casual players alike."
Halo Reach by Clayjrjr2 October 24, 2009

Halo reach

A new medical condition that seems to have originated in bungie studios. It is highly contagious and can be caught by experiencing the highly anticipated game halo reach. Early symptoms consist of fainting and uncontrollable happiness. Later symptoms consist of dropping out of school and/or quitting your job. Other symptoms consist of not wanting to do anything exept play this game. This prevents someone who Is infected from eating, sleeping, and playing shitty video games (ahem mw2). Many experts predict record high cases of this condition on September 14 2010
When halo reach graces your tv screen, you won't be able to resist catching this condition
Halo reach by Ferdoodle24 August 18, 2010

halo rage 

the feeling you get when you get stuck from across the map, lasered, and shot in the left nostril with a sniper 3-5 seconds after you spawn. once halo rage is obtained you will experience, crude and irrational insults coming from your mouth(often involving one's mother, sexually preferences, the lack of genitals, an urge to smash your controller and or mic, as well as a decrease in dryness of one's pants. For 30 minutes-2 hours (depending on how serious the halo rage) you will have these side effects, and the only way to get rid of it is to drink a juice box and atleast 1 hot pocket.
I had serious halo rage yesterday...i punted my dog into the lawn mower.
halo rage by Gerg Craver March 18, 2008