A cunning, sneaky person. On internet forums they are often a liar, fake or poser. Will try to extract information from you to share with others and / or use it against you. Uses shiftiness to evade an obligation, commitment or duty. They will make promises then renege on them. 'Weasel' is very often followed by 'out' as in 'weasel out'.
"Watch her try to weasel out of that one."

"What a fucking weasel that lying bitch is."

"Every insurance company has a weasel clause so they don't have to pay their claim."
by Grund1e September 01, 2006

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shifty, schemeing person that will do whatever they need to to escape whatever they fear in the moment
Listin up you little fucass weasel, if you lie to me again -- you are just gettin' yosef' another slap
by jak February 13, 2003

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One who is particularly cunning, conniving, shifty, sneaky, scheming and down right sly. Weasels are known for their ability to adapt to any situation and to manipulate it to suit their own weasel ways. In other words, my brother Beau.

When used in regard to a female weasel, "weaselette" should be used.

Also used as a verb (ie. to weasel) and as an adjective (eg. weaselish)
"Tell me of your latest weaselish escapades, brother"
"Beau, you are a true weasel!"
"How are you going to weasel your way out of this one?"
"Beware of the weasel"
"Do teach me in the ways of the weasel"
by Weaselette, sister of Weasel October 26, 2008

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a complete asshole who gets out of everything and thinks he will always get out of everything yet everyone who knows him knows he will one day get caught
jon is a fucking weasel!!
by Jason D April 18, 2006

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A shyster. A lawyer. An attorney. A person who earns money by suing people.
Algonquin J. Calhoun is a sneaky little weasel.
by Bumkicker Slade May 07, 2005

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A sneaky, cunning person. Who will do anything in an attempt to steal one's girl. Will try to hook up with a girl who was already hooking up with someone else. Just like the "Situation" when he tries to pull a robbery.
Ryan: Hey so how'd it go with Alyssa at that party last night?
Mike: We were hittin it off all night. But when I went to use the bathroom I got back she was hooking up with Garret in his room. What a fucking weasel
by Ryan Too sick October 18, 2010

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A small rodent like person who is renowned for his sneaky, dishonest and generally unpleasant nature and is universally disliked. The weasel often has dirty gingery hair on his face and snout and is found skulking around in the shadows in a manner very consistent with other rodents.
"That Mennel guy is such a weasel."

"I'm going to exterminate that frickin weasel if I see him in the ECL labs again!"
by Ynngwie J Malmsteen October 23, 2008

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