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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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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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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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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 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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A weasel is a furry little rodent, who tends to be cute and murder birds, like chicken: 2 in 1
Very agile and mobile creature, who can slip through tight spots and eat your eggs, if you aren't watching.

Weasel can also be a description for someone clever or menacing.

Some cartoon or game characters are weasels, where they have sly, slim, clever and sneaky behaviors and they have a nice smirk or a grin on their face. Unlike the real life counterparts, they usually don't eat eggs nor murder birds in cartoons though for some fucked up reason.
After 'someone' stole my eggs from the fridge I yelled out: "The weasel stole the eggs, what I just mugged from someone!"
When someone rips or pulls you off, you probably would think: "What a weasel!"
by MΓΆszick April 19, 2013
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A being so slippery he could worm his way out of any situation. Also has small balls.
A Hindocha is a prime example of a weasel. Has rat like features
by A Choo April 04, 2008
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