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1.
To spill tomato ketchup down a colourwear snowboarding jacket.
Hey Brooke, what is that on your cool jacket?
Oh it's my Stainz!
by chrisberry4 March 19, 2013
 
2.
An exceedingly bad or unlucky player.
Myriad scrubs are stainz when playing complex games.
by Matt Erwin December 01, 2003