monkey rat 

"Monkey Rat" is slang for Opossum. To those who have never gotten up close and personal with an opossum, this slang term may seem silly. However, as more and more South American spieces are available through pet stores, more and more people are familiar with the monkey-like hands and feet, and the prehensile (grabbing) tail of Opossums.

I have a pet monkey rat, and she is the snuggliest of all my pets. And she climbs like crazy!

monkey rat by Virginia Didelphus July 11, 2006

deal rat 

A person addicted to card games of any variety. The term is most often however, used to describe a gambler who plays poker or blackjack on a regular basis.

John is such a deal rat. He's always looking for a poker game!

deal rat by JLH June 20, 2007

Sick Rat 

Most commonly used in Australia. Can be used as an insult to anybody, but generally laid off at your friends or acquaintances in a jokingly manner.

Can also have the potential for appraisals, such as another Australian colloquialism fully sick('fully sick, mate' after can be used as well).

"Your such a sick rat."
OR
"Your such a sick rheeet" (emphasize on the rat to show even more disgust)

Sick Rat by Jonathan.M November 8, 2007

app-rat 

an individual who refuses to delete miscellaneous, useless applications on ones computer. Similar to "pack-rat."

Man 1: John has so many pointless applications on his computer.
Man 2: I know, he's such an app-rat.

app-rat by skierdude2.0 July 26, 2009

hallway rat 

A large collection of annoying misfits occupying the hallways of your high school. Typically they are sitting, running, kissing, listening to music directly in your path and are of general annoyance to everyone.

Hallway rats can easily be identified by overly baggy sweatshirts, clusters of people sitting and obstructing your path, anybody who has their headphone's volume cranked high enough so the whole hallway can hear them, two lovers who cant break apart making out in the hallway, or any group of white kids who hang out in the hallways and try to look gangster.

On my way to englsh class i had to carefully walk through a group of hallway rats who all decided to sit down in front of my classroom door.

Some scraggy looking hallway rat ran straight into me in the hallway and made me drop my books.

An annoying hallway rat was walking in front of me in the hallway with his music cranked up way too loud.

hallway rat by machisimobadass January 21, 2010

rectum rat 

a rat which is smaller than its relatives of which resides in the crevice known as your ass. has the tendency to nibble on your sphincter muscle causing the person to uncontrollably shit their pants.

you should really call the pest controll about that rectum rat

rectum rat by stephenconey121 October 20, 2010

Brook Rat 

Someone from the town of Westbrook, this is someone who likes to get fucked up. Including but not limited to drink alcohol, smoke butt's, smoke weed, smoke crack, blow pill's, blow anything they can get in their nostrils.

some brook rats place in westbrook

Brook Rat by brookrat420 January 23, 2011