The condition when one plays Halo 3 nonstop, night and day, and the rest of the world falls by the wayside, girlfriends disappear, your job disappears etc....
I was in my 40th hour of Halo3itis and took the time to answer the phone and listen to my boss fire me, and my girlfriend kept walking in front of the tv with her boxes she was moving out with.
by ScootM September 28, 2007
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When you can only think of nothing but Halo 3.
Jacob couldn't eat, sleep, or even use the bathroom because of his Halo3itis
by Johnny S.. October 3, 2007
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Girl 1: Liek my boyfriend stopped talking to everyone after he started playing that Halo3 game

Girl 2: Ohmygosh me to, their such dicks
by Watersgirl March 18, 2009
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