Top Definition
The sickness that is obtained from purchasing the newest Halo game for the Xbox 360. To get better you must stay home and play as much Halo as you can, for one to possibly two days depending on how severe your need to play is.
Man, last night I bought Halo 3 and came down with the Halo flu the next day!
by notben September 27, 2007
When someone calls into work sick so they can play Halo.

also known as Halo-itis or Halo-fever
Man, ben has a bad case of Halo Flu
by jEsSi-GuRl October 04, 2007
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