1 definition by mrmaroon25
An injury sustained by a friend that would usually elicit concern and compassion but instead makes the friend the target of ridicule because of the idiotic manner in which the injury was received.
Brian: Dude, what the fuck happened to your leg? That looks nasty!
Matt: Oh yeah dude, I was wasted and I decided to jump off the back of a dump truck into a cougar nest.
Brian: You're a fucking idiot, that's a sinjury.
Matt: Oh yeah dude, I was wasted and I decided to jump off the back of a dump truck into a cougar nest.
Brian: You're a fucking idiot, that's a sinjury.
by mrmaroon25 April 29, 2010