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A snitch. A person who has ""tattled" on another person
That niggas a fuckin rat.
by KiStone 1000 February 05, 2003
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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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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 \ Remote Access Trojan, RATs are malicious programs that run invisibly on host PCs and permit an intruder remote access and complete control designed specifically for stealth installation and operation, RATs can delete and modify files, format hard disks, upload and download files, harass users, and drop off other malware.
an unl3ashed_t3rror dropped a "RAT" proggie and wiped out the hard drives on our clients "RIGS"
by syst3ms September 11, 2009
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Term used to express dissapointment-retro style! Substitute for a more vulgar word in the presence of children and authority figures.
"I didn't get that new job. Rats!"
"Rats! We are out of wine".
by urban ruby October 29, 2007
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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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