1 definition by cass254

Top Definition
When someone has severe memory loss due to excess consumption of alcohol, one is said to have Ninjavitis.
"I can't remember anything about last night, had a serious case of Ninjavitis"

"I can't believe I got with that ugly bird last night, Ninjavitis strikes again"

"Mate where did everyone go last night? Oh Ninjavitis"
by cass254 August 25, 2009

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