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1.
An idea, invention or action that surpasses ingenuity in a sneaky way.
Now that's what i call ninjanuity!

What a ninjenuous idea!
автор: Joey Shithouse 1 марта 2007
 
2.
to react at a certian point in time where you would not be able to do something but only for that point and time, acrobatic like mind wise or even being sneaky
barbra was coming out of the kitchen with 2 plates in her hand as she started to fall derek grabed one of the plates and her with out dropping anything on the floor, and looking highly dramatic. dam derek that was Ninjanuity there
автор: Derek Post 2 июня 2007
 
3.
One's ability to be a ninja
How's your ninjanuity coming along?
автор: The Red One 13 июня 2009
 
4.
The act of swiftly, strongly, intelligently & creatively responding to any situation

adj. Ninjenious
"How did you get out of there alive?" - "Simply ninja-nuity my friend, ninja-nuity."
автор: Sir James Hat 1 декабря 2011
 
5.
The art of sneaking deadly ideas into a project such that they are not detected until it's too late.
Sunni used her ninjanuity to slip a few features into our client-approved website design that are impossible to build. We all reviewed the design, but none of us saw it until it was too late.
автор: javanaut 14 апреля 2011