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An injury obtained while playing ninja.
Dude, what is that cut on your arm from?
It's a ninjury.

Did her ninjury really cause her to go to the ER?
Umm, yeah, she got her eye poked out

ninja
slap
blood
ninjury by Champion Ninja March 14, 2010
(n.) harm or damage done by a ninja
My friend obtained a ninjury over the weekend. He did make it.
ninjury by Lamvao September 30, 2007
"Sorry boss, I wont be in work today, I have a severe 'ninjury' ."
1. An injury suffered while attempting something beyond one's ability. (Often preceded by "Hey, check THIS out!")

2. An injury suffered without the knowledge of the injured party. Possibly caused by ninjas.
1. "Hey, check THIS out; I'm gonna jump this ditch!" *SPLAT* "Dude, you OK? That's a pretty heinous ninjury!"

2. "Dude, where'd you get that cut?" "Beats me, some kind of ninjury."
ninjury by High C September 23, 2012
For example, "playing with ninja stars may result in serious ninjury"
Ninjury by Salenza August 23, 2009
An injury from an accident when performing Lego Ninjago Soinjitzu moves in public
I spun so fast and fell doing my Spinjitzu now I have a ninjury
Ninjury by My nodue sp April 17, 2018