1 definition by Adaptoid

Top Definition
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

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