Top definition
A disease affecting the inner cortex of the brain. Highly contagious and can easily be contracted if individual spends lots of time with a "Gillian".

No cure has been found for the disease. Although the disease is not fatal.
Side effects include dizziness, lack of concentration, amnesia, an increase in appetite, and craziness.
Disease Gilliantitus
by nickname pet December 21, 2013
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