Weasels are mammals of the genus Mustela of the family Mustelidae. The genus Mustela includes the least weasels, polecats, stoats, ferrets and mink. Members of this genus are small, active predators, with long and slender bodies and short legs.

What does it mean to call someone a weasel?

A weasel is a sneaky and sly person. Your weasel of a friend has a habit of "forgetting" his wallet every time he goes out to dinner with you. ... The furry kind of weasel is known for its short legs, long neck, and musky smell. In fact, the word's Proto-Germanic origin wisand carries the meaning of a stinky animal.

Is weasel an offensive term?

In general, if you call someone a weasel they would probably not be happy - but it is not really an offensive word in itself. You are just saying they are dishonest.