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.
by Brian the Ninja December 19, 2006
by Bathing Grape July 24, 2018
by Jester of AKs May 29, 2005
by w00000000000t December 21, 2005
A group (ninjas) or single person (ninja) that is trained in the martial arts. They are the coolest thing on the planet and live in competition with pirates.
Ninjas are so cool that I flipped out, kicked my mom in the face and crapped my pants all in one motion.
by MistahTom November 2, 2005
by B0NZI June 23, 2007
by AwesomeMccooooooooool December 5, 2009