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1.
State of mind that is achieved by playing excessive amounts of Halo for countless hours causing players to completely lose all desire of playing anymore Halo. Players often admit they're halo'ed out when they are tired of playing Halo and have had enough. Occurs often at the end of a halo night.
Man, we played Halo up into the following day until we were halo'ed out.
by Robin_of_Loxly March 23, 2006
 
2.
The act of playing Halo too much, getting tired of it.
Sam: Come on! Play some more Halo with me...

Johnny: Naw man, I'm haloed Out for today.
by llKuKluxKlayll February 16, 2009