Top Definition
A rare disease that gives you the skills of a level 8 ninja master.
Ninjavitus symptoms may include friends and family dying from sudden and uncontrollable karate chops, and the urge to carry ninja stars.
by Evan Salas March 18, 2007
The mysterious loss of a tooth or teeth.
I took a bite out of my sandwich and out came a tooth! Damn you, ninja-vitus
by Lutra Tata August 17, 2011
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