For example, "playing with ninja stars may result in serious ninjury"
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When you are at your place of employment and are assaulted by a hoarde of (or a) ninja(s) this is referred to as an On The Job Ninjury.
Doug: "Where's Fred today? I didn't see him in his newly bloodstained cubicle!"
Ernest: "That bastard was attacked by ninja's yesterday, hence the blood stains."
Doug: "being a victim of an On The Job Ninjury is awful. this has been a Public Service Announcement..."
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When you wake up with an ache or pain with no recollection of how you sustained it.
I woke up with another ninjury today. Weird thing is I literally sat on my arse all day yesterday.
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