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Definitions by Steve Ph

Halo twosis 

When you pull an all-nighter of Halo two online and forget to brush your teeth, resulting in bad horrible breath.

Can also be used with halo 3 if you have an X-box 360
Stan and Justin were up all night playing halo two online.

How do you know that?

They have Halo twosis
Halo twosis by Steve Ph December 9, 2008