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An add-on that signifies that something is really badass, dangerous, or hardcore and might seriously fuck you up.
Yosef: "Check out this awesome gat I've got. I think I'm gonna go to the ghetto and shoot someone!"
Abraham: "That's a BB gun, dude. It probably won't even break the skin."
Yosef: "Whatever, man. It's the BB gun of DOOM! It could kill you, seriously. Watch out!"
*BANG!*
Abraham: "You just shot me, you fucking idiot! That left a mark...oh, no wait, it's gone."
Yosef: "DAMN!!!"
by Nick D July 19, 2004
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Mario's mom sucked me off in exchange for a fat ass doom-doom
by SUX2BU October 16, 2003
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A bad ass game with a bad ass story with the most ass kicking guy (doom guy) in the multiverse
Doom is the best game ever, my favourite demon is the cyber-mancubus
by odd_guy_59 February 16, 2018
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A classic first-person shooter (FPS) made by ID Software, the same folks who made quality games like Wolfenstein and Quake.
When playing Doom, watch out for the Cyberdemon, for his rocket-launcher arm can easily kill you.
by AYB July 29, 2003
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A game which all players of Counter-Strike, Halo, Quake et al should thank for making the first-person shooter genre what it is today.

Doom is a classic in the true sense of the word. It spawned techniques still used in First-Person Shooters today.
Doom >is greater than> CS+HL+Halo+Quake+Unreal+GoldenEye

All are fantastic games, but Doom outranks them all. After all, Doom is simply legendary among shooter fans, even more so than the seminal CS. Thank Doom, with its crude 2D sprites, blocky graphics and unparalleled gameplay.
by Comrade Dmitri April 2, 2004
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One of the greatest FPS of all time. While the game may look outdated today, the gameplay is unparalleled even today. The game plays incredibly well even nowadays. Most fanboys/fags say it sucks because the graphics are bad, but in that case, they need to fuck themselves. Gameplay > graphics.
Halo faggot: omg omg omgomgom Doom sucks halo is BETATAT!!!!1
Normal person: You fail it. Without Doom, Halo would have never existed, so suck your boyfriend's cock and chill out.
by Bashe August 21, 2005
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