rat

A person who exposes another person's wrongdoings for reasons other than moral outrage or to seek justice. Usually for personal gain, to avoid trouble themselves, or out of jealousy.

The word is sometimes misused by highly immoral people to describe all people who provide incriminating evidence against other people, simply because they dislike the idea of being exposed, and want to associate a negative word with people who expose immorality.
Grant exposed the other members of his gang so the cops would reduce his sentence. He's a rat.
by link1834 April 11, 2012
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rat

Someone who tells the cops vital information that leads to an arrest of another person
that nigga cody ratted on joe we should fuck him up
by mikeykay October 30, 2006
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rat

A snitch. A person who has ""tattled" on another person
That niggas a fuckin rat.
by KiStone 1000 February 06, 2003
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rat

the lowest form of human being. a backstabbing snitch.
by umadeabigmistake May 12, 2009
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rat

Small, prolific and extremely intelligent member of the rodent family. Rats make fantastic pets and are considered to be as smart as dogs. They can learn their name and various tricks if their owner takes the time to teach them. They are extremely sociable and bond closely to their human owner.
In the wild they live in family groups, much like wolves, and have a similar social structure with an alpha, beta and omega.

The pet rat is the species rattus norvegicus, the brown or norway rat, whereas the rat associated (incorrectly, it must be said) with the plague is rattus rattus, the black rat. Domestic rats do not carry any diseases transmittable to humans and even wild rats are generally cleaner than most other wild animals, as well as the notable fact that it is impossible for a rat to transmit rabies to a person.

Rats have a very undeserved reputation, but this is slowly changing as more people realise what good pets they make.
I own 5 pet rats
There is a rat in the garden
by SicPuppy August 15, 2005
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rat

1. Small rodent frequently abused by humans
"Oh look, It's a rat."
"Eu, kick it!"
by Shuriken January 26, 2003
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rat

A term used to describe anyone who has the following characteristics: lazy, good for nothing, cheap, always drunk, always sober, dancing with a hot chick, dancing with an ugly chick, plays video games all day, wears better clothing then you, wears worst clothing then you, obnoxious, says stupid things, does stupid things, hoards food, sleeps all day, eats all day, pisses in the sink, pees in pools (not while in them, stands on the side and pees in them), likes tequila, hates tequila, eats the last of piece of food, uses the word agwan, and of course eats cheese!
Guy 1, "Hey look at what Duncan is doing!"
Guy 2, "He is such a rat!"
Guy 3, "Wow, what a rat."
Girl 1, "Rat."
Guy 4, "You are all rats!"
by Ian Frith March 30, 2008
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