I've noticed a lot of people are assholes, and give biased definitions saying it either "r0xxorzez all t3h othar games!!11!!1!111" or "is a total fag noob shitty game" This is an unbiased definition of HALO: Combat evolved:
1:n.A first-person-shooter game for the Microsoft X-box in which the main protagonist Master Chief and his A.I. guide Cortana fight through a giant alien construct (the halo) in space alongside marines to destroy it before it eradictes all life in the universe. To further complicate things, the Covenant, a hierarchy of aliens bent on killing humans because they are believed to be inferior, have landed on the ring and believe it to be a sacred artifact, so they naturally try to defend it. Also, a parasitic plague known as the flood have been contained on the ring, and are released by the covenant. An evil and unsatiable appetite for sentient flesh drives the flood to infect and destroy all biological matter in the universe, and the Master Chief must get through them too to destroy the ring (which leads to a couple of the most annoying levels ever in game history). Halo and it's successor, HALO 2, have active online communities, as they both sport a form of online play.
2.adj.High Altitude Low Opening jump from a plane
1) Halo is an addictive fps (In my own opinion) for the Xbox. Many people say it's "linear" "repetitive" "slow" or "has crappy graphics", or that "people who think halo rules don't play fps games". I love halo, along with games like: Half-life (1 and 2), Far-Cry, The Medal of Honor and Call of Duty series, and Resistence: Fall of Man to name a few. Furthermore, people are too hooked on free-roam games with gorgeous graphics, without it occurring to them that maybe if a game has good gameplay (which i personally believe it does), then it really doesn't matter. God of War has linear gameplay with somewhat repetitive enemies, but the gameplay is so good you overlook that. People need to think more.
2. Alpha team made a HALO jump from the plane
by Lewk the Dewk April 29, 2007
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1. without this game most guys would spend most of their time masturbating
2. code word: group, all male, masturbating.
3. electronic circle jerk, multiguy mission.
1. Pedro, come over we're gonna play Halo.
--Okay I'll bring the tissues.
by Yessel January 17, 2005
n. 1. GAME The best and most popular x-box game. Made by Bungie.
2. RELIGIOUS OBJECT a glowing ring of light surrounding Bible-era religious figures. 3. MILITARY A high altitude/low opening parachute jump, where a jumper exits the plane at around 30,000 feet and opens at around 1,000.
Let's go play Halo for 7 hours at a sleepover!

Your halos are glowing so brightly we won't need the lamps, that's very nice.

Richard Marcinko pulled a textbook HALO jump yesterday.
by Dev July 21, 2003
1) bright glowing ring above the head of religious figures
2)a game for xbox and later PC made by bungie; considered by some to be the best game available on xbox
3) military parachute jump (hi altitude, low opening)
master chief jumping from a plane with a ring above his head would satisfy all three
by sir PEACH June 15, 2004
1.a religous circular object above ones head

2.a religous circular object put into an xbox
tim:did you kno god had a halo

me:no shit he had halo its the best game ever
by Nick Schuler June 19, 2007
High Altitude Low Opening.
Commonly used by British SAS army forces to enter hostile or unfriendly territories.
by Diego July 08, 2003
A religious symbol ussually associated with the Bible and commonly used in paintings in the medieval era of saints etc.
A First Person Shooter for Xbox with an strong storyline, amusing physics, great multiplayer, and great controls. Slightly overrated.
The young girls heart was so pure you could practically see a halo over her head.

Halo, beer, and 16 people.
by Takun June 26, 2004
1. A disk (or a ring, more recently) above one's head, usually used in religious context. A halo usually indicates that the one below the halo is a good person.

2. A video game series developed by Bungie Studios, starting with Halo: Combat Evolved back in 2001. Combat Evolved is widely recognized as the game that single-handedly brought attention to the Xbox. Halos 2 and 3, released in 2004 and 2007, respectively, were very well received.
The series' popularity led to two spin-off games, Halo Wars, developed by Ensemble Studios rather than Bungie, and Halo 3: ODST, essentially a filler for the time between Halo 3's release in '07 and Halo: Reach, a game set to be released in 2010. Since Halo 2, Halo's online multiplayer has been incredibly well-received by anyone who doesn't have a shit connection.
Many gamers think Halo is an overrated and generic FPS. Generally, the rest seem to think that Halo is the greatest thing ever to grace their souls. There is an equilibrium, which is the reasonable players who feel that enjoying one game does not make you 100% exclusive.

Canonically, the correct timeline for Halo is:
Halo Wars
Halo: Reach
Halo: Combat Evolved
Halo 2
Halo 3: ODST
Halo 3
Just because Halo fanboys can be insufferable, doesn't mean the game is shit. Any reasonable person wouldn't call the game anything short of amazing.
Remember kids, Urban Dictionary is a place for definitions, not slander or favoritism.
by Indifferent Dictionary January 29, 2010
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