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The feeling one gets when thinking about writing their thesis, usually making them feel physically and/or mentally ill.

Symptoms can include, nausea, lethargy, incoherent conversations and sometimes momentary lapses of motor skills (eg. walking).

Without treatment thesisitis can result in excessive desk chair racing and may result in injury.
Student: Man, every time I think about my thesis I feel sick.
Friend: Well maybe you've got thesisitis, it's probably a good idea to take the day off.

Student: Today I rode an elephant backwards up the stairs.
Concerned friend: Pretty sure you have thesisitis... I'm just gonna keep my distance in case it's contagious.
by FY procrastination April 13, 2011
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