A girl who messes with you, creates a lot of drama, and thinks that they're the greatest thing to ever happen to the world......when they're not in any possible way.
Mike said she's a rat because she's bein an annoying bitch cuz she's jealous and is tryin to ruin the relationship he has without her.
by an experienced man May 01, 2010
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
A word annoying teenage boys use when describing a person in attempt to make fun of them. What they don't realize is by saying it they are making more of a fool out of themselves then who it is directed towards.
Kid's a rat.
by exterminator . May 10, 2009
The juvenile definition is simnply of a snitch but a rat is really a traitor. If you're onvolved in crime or a gang & you snitch, you are a rat -- & rats must die!
Me & Jimmy whacked that gas station dude cuz he was slow with the money we wanted, then, when the pigs questioned him, he was a wuss and rolled over on me -- so I got to whack the little rat now!
by cyberpope67,BC,Canada December 08, 2008
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
means ridiculous arrogant tool. generally someone who wears a polo shirt and sunglasses with a neck strap. they also tend to say 'yo' and 'sup' alot. they might also play soccer, but this isn't always the case.
chubbs: yo! sup guys?

me talking to friend: oh god, here comes that r.a.t.
by crabsack February 10, 2012
Chevy big block engine;
396 - 502 cubic inch engine;
the most universal drag race motor,
Designed better than any Ford or Japanesse engine
that rat powered Chevy Nova just spanked my 5.0 Ford
by chevy hotrodder February 25, 2003
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