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12.
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
 
1.
(verb) To stick one’s penis up someone else’s arse unexpectedly and without prior warning.
She received a rude awakening when he shit weaseled her from behind.
by The Empress 3 November 05, 2010
 
2.
An animal or person who is sly, sneaky, and opportunistic. Someone who is looking to slip their way into a situation and make it shittier.
"Your friend is such a shitweasel, every time he comes over, he creates drama by asking questions and exploiting their answers to upset people."

"My cat is the ultimate shitweasel. He somehow manages to open the door to my bedroom and urinate in the corner, even though I am very vigilant about keeping it closed and locked."
by JohnnyClemz June 14, 2008
 
3.
An alien parasite that grows in the bowels, causes massive amounts of gas that smells like rotten bananas, and eventually eats its way out through your asshole.
Holy shit, what's that smell?! OH MY GOD, WHAT'S COMING OUT YOUR ASS?!?!
by shiatweasel November 18, 2003
 
4.
In the corporate world, a shit weasel is a person of similar or higher rank who'll stab you in the back, deny he did it, and blame you for the stabbing. The shit-weasel will deflect blame off of himself/herself in order to maintain his/her reputation at all cost.
That shit-weasel just blamed me for the failure of his own system and convinced the SVP it was my responsibility to begin with. Now I'm in hot water and he's getting his bonus.
by ronmag June 07, 2011
 
5.
Like a scumweasel, but clever and much more likely to do you harm.
When that shitweasel Delbert comes knocking at your door with a fist full of Amway brochures ranting about "bidness oppertunetties", bar the door, hide your money and go for your gun.
by harry flashman July 03, 2003
 
6.
A shitweasel is a term for an ass kissing co-worker or otherwise lowly, groveling person.
"Maggie gets her work done and more, but I still don't trust the shitweasel bitch."

"That shitweasel tried to pick-up on me, I told him to come back when his balls drop."
by Jim Inman August 17, 2006
 
7.
a Shit Weasel is a thing encubated
in someones stomach and the person
will suffer or (accuire the power of)
really smelly farts and a bleeding anus
the farts smell of ether and bananas
i have no idea why...
also known as Byrums
oh man what the hell died in your ass?
"nothing i just have a Shit-Weasel"
by Takato-Defuniak August 13, 2003