mongrel rat 

this word can be used in many ways and is quite diverse, but is commonly an insult.
1. someone who is grimey. maybe they haven't showered. or they are a slob.
2. a person who is schemey or annoying
3. typically a friend that pisses you off in some way

"damn mongrel rat"

mongrel rat by Petrarca July 5, 2009

pot rat 

Some one who somokes marijuana all the time, and is constantly looking to get high.24/7 once they come down from their high, they get stoned again. Mostly a neggative person that acts like a rat always trying to smoke pot and smokes the blunt or joint past the roach.always talks neggatively and uses sarcasm like a buster

Bill: hey man. Terry is such a damn pot rat .
Tom: hell yeah he is always trying to get high with us for free and talks shit all the time.
Bill: that Fool makes my high come down

pot rat by FALSEer November 21, 2009

Bird Rat Goof 

someone who won't leave you alone and who will snitch on you and is a totall goof

Dylan Depaiva & Jacob Enticott is such a Bird Rat Goof,

Bird Rat Goof by bidratgoof July 17, 2010

Blunt Rat 

Someone who smokes other people's weed and never actually owns any weed to share.

Tyrone: Yous a mutha fuc*&^% blunt rat smoking all our weed.
Jamal: Man ill buy some next time... chill

Blunt Rat by shovmyfist November 3, 2010

Fed Rat

a slang term used to describe a police officer. offensive, similar meaning to the word pig.

"Fuck Da Fed Rat Batty Man!!!!"

Fed Rat by the mysterious P.I.G May 19, 2012

field rat 

A field rat is a person who looks or scurrys around sort of like a rat in a field

The field rat was looking around

field rat by That ccte boy June 3, 2016

computer rat

An oversized computer mouse

Move the computer rat

computer rat by Billiam Beaver July 6, 2016