1) A punk bitch that snitches on others to avoid prosecution.
2). A large rodent that resides in sewers with a voracious appetite for city cats.
That rat Burke snitched on me so now I'm gonna tie him up and feed him to the sewer rats.
A person that ticked off a girl and the girl has given the boy the name of "Rat" meaning that they are stupid, ugly, and dumb
Conner is a rat because he didn't give me the baseball
Your pesky weird friend of yours, they are interested in everything their friend does and snorts alot for no reason.