Comes from Stephen King's book, Dreamcatcher. Humans who eat the alien virus call "byrus" grow an alien weasel in their bowles and when it gets too big it bursts out of their butt.
"Mcarthy's lower midsection was covered in blood as the shit-weasel came out"
by Patti March 01, 2005

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When there is an intense, overwhelming painful cramping in the stomach and abdomenal region that usually ends results in one bent over clutching themselves in pain. Sometimes there are the noises of a weasle running around and screaming to be released, by means of diarrahea. Side effects may include: goosebumps, shivering, crying, cramping, burning of the anus, sweating, and sharting or aka shit farting.
"Oh man, my stomach hurts sooo bad, I think I have a shit weasel running around and wants to get out oooouch!!" and then run to the bathroom for relief.
by Corinne G. May 08, 2007

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Alien creature that resembles a lamprey. It developes inside a human host until it bursts out of their ass.
"Boy did that shit weasel burst out of my ass. I sure am dead now."
by William March 29, 2003

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A phrase normally utilized to expressing aggravation toward someone you are well aquainted with.
"Hey shit weasel! Were the fuck did you put the nutella?"
by poshloster 3000 December 29, 2011

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a person who is of no use to society (slang)
get outta here you shit weasel!!
by crabman250 January 09, 2010

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Infection form of the flood from Halo and Halo 2.
Holy crap! Look at that wave of shit weasels! Run!
by Mike Montuori May 06, 2005

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Someone who is continually "pressing others buttons" just for their own amusement.
What fucking shit weasel did this!
by jjsw January 20, 2004

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The Urban Dictionary T-Shirt

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