cari istilah yang lo mau, kaya' lemonparty:
 
1.
The act of being a ninja or doing ninja related things, such as jumping building, running with your hands loosely behind you, or climbing up trees and hiding until your "Target" approaches.
He displayed his awesome Ninjaness when he jumped from that K-mart to the Subway.
dari Brian the Ninja Selasa, 19 Desember 2006
 
2.
The amount of inner ninja possessed by an individual.
That guy has so much ninjaness hes almost like Chuck Noris
dari w00000000000t Selasa, 20 Desember 2005
 
3.
epic, stealthy, loyd-ragey, and otherwise awsome descriptive noun
VJ-please, let loyd rub some of his ninja-ness of on me!
meanwhile, loyd sneaks behind vj and knocks him out with a karote chop.
dari Lwai & Dcon Senin, 06 April 2009