The result of a late night of extremely intense Halo playing.

Symptoms include, but are not limited to: headache, drowsiness, nausea, bloodshot eyes, and sniper paranoia.
"Ugh, I'll never play Halo again; I'm paying for it with Halo Hangover."

"I'm so sleepy. I haven't had Halo Hangover in a while."
by Adaptoid April 11, 2007
When you stay up into the early hours of the morning playing Halo, then feel like crap the next day.
"I finally beat Halo 3 on LEGENDARY, but now I have and awful Halo hangover.
by Kowdee December 23, 2008
The headache you get after staying up all night playing xbox or other game system.
"I was playin xbox till 4 AM and then woke up at 9 with a halo-hangover"
by Country Boy Jim October 29, 2009

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